diff --git a/app/controllers/api/v2/dossiers_controller.rb b/app/controllers/api/v2/dossiers_controller.rb
index 0612aaf53..3c627bd36 100644
--- a/app/controllers/api/v2/dossiers_controller.rb
+++ b/app/controllers/api/v2/dossiers_controller.rb
@@ -2,7 +2,7 @@ class API::V2::DossiersController < API::V2::BaseController
   before_action :ensure_dossier_present
 
   def pdf
-    @acls = PiecesJustificativesService.new(user_profile: Administrateur.new).acl_for_dossier_export(dossier.procedure)
+    @acls = PiecesJustificativesService.new(user_profile: Administrateur.new, export_template: nil).acl_for_dossier_export(dossier.procedure)
     render(template: 'dossiers/show', formats: [:pdf])
   end
 
diff --git a/app/controllers/instructeurs/dossiers_controller.rb b/app/controllers/instructeurs/dossiers_controller.rb
index 04085f7c2..7ab9a717d 100644
--- a/app/controllers/instructeurs/dossiers_controller.rb
+++ b/app/controllers/instructeurs/dossiers_controller.rb
@@ -45,7 +45,7 @@ module Instructeurs
       @is_dossier_in_batch_operation = dossier.batch_operation.present?
       respond_to do |format|
         format.pdf do
-          @acls = PiecesJustificativesService.new(user_profile: current_instructeur).acl_for_dossier_export(dossier.procedure)
+          @acls = PiecesJustificativesService.new(user_profile: current_instructeur, export_template: nil).acl_for_dossier_export(dossier.procedure)
           render(template: 'dossiers/show', formats: [:pdf])
         end
         format.all
diff --git a/app/controllers/instructeurs/procedures_controller.rb b/app/controllers/instructeurs/procedures_controller.rb
index 8caf08fee..1559dca8c 100644
--- a/app/controllers/instructeurs/procedures_controller.rb
+++ b/app/controllers/instructeurs/procedures_controller.rb
@@ -324,13 +324,18 @@ module Instructeurs
     end
 
     def export_format
-      @export_format ||= params[:export_format]
+      @export_format ||= params[:export_format].presence || export_template&.kind
+    end
+
+    def export_template
+      @export_template ||= ExportTemplate.find(params[:export_template_id]) if params[:export_template_id].present?
     end
 
     def export_options
       @export_options ||= {
         time_span_type: params[:time_span_type],
         statut: params[:statut],
+        export_template:,
         procedure_presentation: params[:statut].present? ? procedure_presentation : nil
       }.compact
     end
diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index 6176ce7f3..db49503c7 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -88,7 +88,7 @@ module Users
     end
 
     def show
-      pj_service = PiecesJustificativesService.new(user_profile: current_user)
+      pj_service = PiecesJustificativesService.new(user_profile: current_user, export_template: nil)
       respond_to do |format|
         format.pdf do
           @dossier = dossier_with_champs(pj_template: false)
diff --git a/app/lib/active_storage/downloadable_file.rb b/app/lib/active_storage/downloadable_file.rb
index b89c20997..57e919ff3 100644
--- a/app/lib/active_storage/downloadable_file.rb
+++ b/app/lib/active_storage/downloadable_file.rb
@@ -1,8 +1,8 @@
 require 'fog/openstack'
 
 class ActiveStorage::DownloadableFile
-  def self.create_list_from_dossiers(dossiers:, user_profile:)
-    pj_service = PiecesJustificativesService.new(user_profile:)
+  def self.create_list_from_dossiers(dossiers:, user_profile:, export_template: nil)
+    pj_service = PiecesJustificativesService.new(user_profile:, export_template:)
 
     pj_service.generate_dossiers_export(dossiers) + pj_service.liste_documents(dossiers)
   end
diff --git a/app/lib/download_manager/parallel_download_queue.rb b/app/lib/download_manager/parallel_download_queue.rb
index 16dcbd762..35a6b8695 100644
--- a/app/lib/download_manager/parallel_download_queue.rb
+++ b/app/lib/download_manager/parallel_download_queue.rb
@@ -12,6 +12,8 @@ module DownloadManager
     end
 
     def download_all
+      # TODO: arriver à enelver ce parametrage d'ActiveStorage
+      ActiveStorage::Current.url_options = { host: ENV.fetch("APP_HOST") }
       hydra = Typhoeus::Hydra.new(max_concurrency: DOWNLOAD_MAX_PARALLEL)
 
       attachments.each do |attachment, path|
diff --git a/app/models/champ.rb b/app/models/champ.rb
index 2cb0bb4ec..6d3f02f11 100644
--- a/app/models/champ.rb
+++ b/app/models/champ.rb
@@ -91,6 +91,14 @@ class Champ < ApplicationRecord
     parent_id.present?
   end
 
+  def stable_id_with_row
+    [row_id, stable_id].compact
+  end
+
+  def row_index
+    Champ.where(parent:).pluck(:row_id).sort.index(:id)
+  end
+
   # used for the `required` html attribute
   # check visibility to avoid hidden required input
   # which prevent the form from being sent.
diff --git a/app/models/export.rb b/app/models/export.rb
index 66832d5e1..d9b29d409 100644
--- a/app/models/export.rb
+++ b/app/models/export.rb
@@ -67,9 +67,10 @@ class Export < ApplicationRecord
     procedure_presentation_id.present?
   end
 
-  def self.find_or_create_fresh_export(format, groupe_instructeurs, user_profile, time_span_type: time_span_types.fetch(:everything), statut: statuts.fetch(:tous), procedure_presentation: nil)
+  def self.find_or_create_fresh_export(format, groupe_instructeurs, user_profile, time_span_type: time_span_types.fetch(:everything), statut: statuts.fetch(:tous), procedure_presentation: nil, export_template: nil)
     attributes = {
       format:,
+      export_template:,
       time_span_type:,
       statut:,
       key: generate_cache_key(groupe_instructeurs.map(&:id), procedure_presentation)
@@ -148,7 +149,7 @@ class Export < ApplicationRecord
   end
 
   def blob
-    service = ProcedureExportService.new(procedure, dossiers_for_export, user_profile)
+    service = ProcedureExportService.new(procedure, dossiers_for_export, user_profile, export_template)
 
     case format.to_sym
     when :csv
diff --git a/app/services/pieces_justificatives_service.rb b/app/services/pieces_justificatives_service.rb
index 2fece0c0b..22040d4e0 100644
--- a/app/services/pieces_justificatives_service.rb
+++ b/app/services/pieces_justificatives_service.rb
@@ -1,6 +1,7 @@
 class PiecesJustificativesService
-  def initialize(user_profile:)
+  def initialize(user_profile:, export_template:)
     @user_profile = user_profile
+    @export_template = export_template
   end
 
   def liste_documents(dossiers)
@@ -58,7 +59,11 @@ class PiecesJustificativesService
         created_at: dossier.updated_at
       )
 
-      pdfs << ActiveStorage::DownloadableFile.pj_and_path(dossier.id, a)
+      if @export_template
+        pdfs << @export_template.attachment_and_path(dossier, a)
+      else
+        pdfs << ActiveStorage::DownloadableFile.pj_and_path(dossier.id, a)
+      end
     end
 
     pdfs
@@ -153,9 +158,14 @@ class PiecesJustificativesService
       .includes(:blob)
       .where(record_type: "Champ", record_id: champ_id_dossier_id.keys)
       .filter { |a| safe_attachment(a) }
-      .map do |a|
+      .map do |a, _i|
         dossier_id = champ_id_dossier_id[a.record_id]
-        ActiveStorage::DownloadableFile.pj_and_path(dossier_id, a)
+        pj_index = Champ.find(a.record_id).piece_justificative_file.blobs.map(&:id).index(a.blob_id)
+        if @export_template
+          @export_template.attachment_and_path(Dossier.find(dossier_id), a, index: pj_index, row_index: a.record.row_index)
+        else
+          ActiveStorage::DownloadableFile.pj_and_path(dossier_id, a)
+        end
       end
   end
 
diff --git a/app/services/procedure_export_service.rb b/app/services/procedure_export_service.rb
index 75eab89e8..5503a8a14 100644
--- a/app/services/procedure_export_service.rb
+++ b/app/services/procedure_export_service.rb
@@ -1,10 +1,11 @@
 class ProcedureExportService
   attr_reader :procedure, :dossiers
 
-  def initialize(procedure, dossiers, user_profile)
+  def initialize(procedure, dossiers, user_profile, export_template)
     @procedure = procedure
     @dossiers = dossiers
     @user_profile = user_profile
+    @export_template = export_template
   end
 
   def to_csv
@@ -36,7 +37,7 @@ class ProcedureExportService
   end
 
   def to_zip
-    attachments = ActiveStorage::DownloadableFile.create_list_from_dossiers(dossiers:, user_profile: @user_profile)
+    attachments = ActiveStorage::DownloadableFile.create_list_from_dossiers(dossiers:, user_profile: @user_profile, export_template: @export_template)
 
     DownloadableFileService.download_and_zip(procedure, attachments, base_filename) do |zip_filepath|
       ArchiveUploader.new(procedure: procedure, filename: filename(:zip), filepath: zip_filepath).blob
diff --git a/spec/controllers/experts/avis_controller_spec.rb b/spec/controllers/experts/avis_controller_spec.rb
index 7a4029eed..e58b4d2bb 100644
--- a/spec/controllers/experts/avis_controller_spec.rb
+++ b/spec/controllers/experts/avis_controller_spec.rb
@@ -121,7 +121,7 @@ describe Experts::AvisController, type: :controller do
       context 'with a valid avis' do
         it do
           service = instance_double(PiecesJustificativesService)
-          expect(PiecesJustificativesService).to receive(:new).with(user_profile: expert).and_return(service)
+          expect(PiecesJustificativesService).to receive(:new).with(user_profile: expert, export_template: nil).and_return(service)
           expect(service).to receive(:generate_dossiers_export).with(Dossier.where(id: dossier)).and_return([])
           expect(service).to receive(:liste_documents).with(Dossier.where(id: dossier)).and_return([])
           is_expected.to have_http_status(:success)
diff --git a/spec/controllers/instructeurs/dossiers_controller_spec.rb b/spec/controllers/instructeurs/dossiers_controller_spec.rb
index 8b99ff44f..8add60a04 100644
--- a/spec/controllers/instructeurs/dossiers_controller_spec.rb
+++ b/spec/controllers/instructeurs/dossiers_controller_spec.rb
@@ -936,7 +936,7 @@ describe Instructeurs::DossiersController, type: :controller do
         subject
       end
 
-      it { expect(assigns(:acls)).to eq(PiecesJustificativesService.new(user_profile: instructeur).acl_for_dossier_export(dossier.procedure)) }
+      it { expect(assigns(:acls)).to eq(PiecesJustificativesService.new(user_profile: instructeur, export_template: nil).acl_for_dossier_export(dossier.procedure)) }
       it { expect(assigns(:is_dossier_in_batch_operation)).to eq(false) }
       it { expect(response).to render_template 'dossiers/show' }
 
diff --git a/spec/controllers/instructeurs/procedures_controller_spec.rb b/spec/controllers/instructeurs/procedures_controller_spec.rb
index ca0e1a4a9..3f34c3e53 100644
--- a/spec/controllers/instructeurs/procedures_controller_spec.rb
+++ b/spec/controllers/instructeurs/procedures_controller_spec.rb
@@ -736,6 +736,18 @@ describe Instructeurs::ProceduresController, type: :controller do
       end
 
       it { expect { subject }.to change { Export.where(user_profile: instructeur).count }.by(1) }
+
+      context 'with an export template' do
+        let(:export_template) { create(:export_template) }
+        subject do
+          get :download_export, params: { export_template_id: export_template.id, procedure_id: procedure.id }
+        end
+
+        it 'displays an notice' do
+          is_expected.to redirect_to(exports_instructeur_procedure_url(procedure))
+          expect(flash.notice).to be_present
+        end
+      end
     end
 
     context 'when the export is not ready' do
diff --git a/spec/controllers/users/dossiers_controller_spec.rb b/spec/controllers/users/dossiers_controller_spec.rb
index e0fd3501e..fb1a28e53 100644
--- a/spec/controllers/users/dossiers_controller_spec.rb
+++ b/spec/controllers/users/dossiers_controller_spec.rb
@@ -1142,7 +1142,7 @@ describe Users::DossiersController, type: :controller do
       end
 
       context 'when the dossier has been submitted' do
-        it { expect(assigns(:acls)).to eq(PiecesJustificativesService.new(user_profile: user).acl_for_dossier_export(dossier.procedure)) }
+        it { expect(assigns(:acls)).to eq(PiecesJustificativesService.new(user_profile: user, export_template: nil).acl_for_dossier_export(dossier.procedure)) }
         it { expect(response).to render_template('dossiers/show') }
       end
     end
diff --git a/spec/models/export_spec.rb b/spec/models/export_spec.rb
index 5e7e1eda3..5b2a8ae99 100644
--- a/spec/models/export_spec.rb
+++ b/spec/models/export_spec.rb
@@ -109,6 +109,14 @@ RSpec.describe Export, type: :model do
       end
     end
 
+    context 'with export template' do
+      let(:export_template) { build(:export_template) }
+      it 'creates new export' do
+        expect { Export.find_or_create_fresh_export(:zip, [gi_1], instructeur, export_template: export_template, time_span_type: Export.time_span_types.fetch(:everything), statut: Export.statuts.fetch(:tous), procedure_presentation: pp) }
+          .to change { Export.count }.by(1)
+      end
+    end
+
     context 'with existing matching export' do
       def find_or_create =
         Export.find_or_create_fresh_export(:zip, [gi_1], instructeur, time_span_type: Export.time_span_types.fetch(:everything), statut: Export.statuts.fetch(:tous), procedure_presentation: pp)
diff --git a/spec/services/pieces_justificatives_service_spec.rb b/spec/services/pieces_justificatives_service_spec.rb
index 7a212912e..771cb8e96 100644
--- a/spec/services/pieces_justificatives_service_spec.rb
+++ b/spec/services/pieces_justificatives_service_spec.rb
@@ -2,8 +2,9 @@ describe PiecesJustificativesService do
   describe '.liste_documents' do
     let(:dossier) { create(:dossier, procedure: procedure) }
     let(:dossiers) { Dossier.where(id: dossier.id) }
+    let(:export_template) { nil }
     subject do
-      PiecesJustificativesService.new(user_profile:).liste_documents(dossiers).map(&:first)
+      PiecesJustificativesService.new(user_profile:, export_template:).liste_documents(dossiers).map(&:first)
     end
 
     context 'no acl' do
@@ -19,6 +20,11 @@ describe PiecesJustificativesService do
         end
 
         it { expect(subject).to match_array(pj_champ.call(dossier).piece_justificative_file.attachments) }
+
+        context 'with export_template' do
+          let(:export_template) { create(:export_template, groupe_instructeur: procedure.defaut_groupe_instructeur).tap(&:set_default_values) }
+          it { expect(subject).to match_array(pj_champ.call(dossier).piece_justificative_file.attachments) }
+        end
       end
 
       context 'with a multiple attachments' do
@@ -303,7 +309,7 @@ describe PiecesJustificativesService do
     let(:procedure) { create(:procedure, types_de_champ_public: [{ type: :repetition, children: [{ type: :piece_justificative }] }]) }
     let(:dossier) { create(:dossier, :with_populated_champs, procedure: procedure) }
     let(:dossiers) { Dossier.where(id: dossier.id) }
-    subject { PiecesJustificativesService.new(user_profile:).generate_dossiers_export(dossiers) }
+    subject { PiecesJustificativesService.new(user_profile:, export_template: nil).generate_dossiers_export(dossiers) }
 
     it "doesn't update dossier" do
       expect { subject }.not_to change { dossier.updated_at }
@@ -315,7 +321,7 @@ describe PiecesJustificativesService do
       let!(:not_confidentiel_avis) { create(:avis, :not_confidentiel, dossier: dossier) }
       let!(:expert_avis) { create(:avis, :confidentiel, dossier: dossier, expert: user_profile) }
 
-      subject { PiecesJustificativesService.new(user_profile:).generate_dossiers_export(dossiers) }
+      subject { PiecesJustificativesService.new(user_profile:, export_template: nil).generate_dossiers_export(dossiers) }
       it "includes avis not confidentiel as well as expert's avis" do
         expect_any_instance_of(Dossier).to receive(:avis_for_expert).with(user_profile).and_return([])
         subject
diff --git a/spec/services/procedure_export_service_spec.rb b/spec/services/procedure_export_service_spec.rb
index aa2fb3733..9109124f4 100644
--- a/spec/services/procedure_export_service_spec.rb
+++ b/spec/services/procedure_export_service_spec.rb
@@ -2,8 +2,9 @@ require 'csv'
 
 describe ProcedureExportService do
   let(:instructeur) { create(:instructeur) }
-  let(:procedure) { create(:procedure, :published, :for_individual, :with_all_champs, instructeurs: [instructeur]) }
-  let(:service) { ProcedureExportService.new(procedure, procedure.dossiers, instructeur) }
+  let(:procedure) { create(:procedure, :published, :for_individual, :with_all_champs) }
+  let(:service) { ProcedureExportService.new(procedure, procedure.dossiers, instructeur, export_template) }
+  let(:export_template) { nil }
 
   describe 'to_xlsx' do
     subject do
@@ -243,7 +244,7 @@ describe ProcedureExportService do
 
       context 'as csv' do
         subject do
-          ProcedureExportService.new(procedure, procedure.dossiers, instructeur)
+          ProcedureExportService.new(procedure, procedure.dossiers, instructeur, export_template)
             .to_csv
             .open { |f| CSV.read(f.path) }
         end
@@ -519,39 +520,68 @@ describe ProcedureExportService do
       end
     end
 
-    context 'generate_dossiers_export' do
+    describe 'generate_dossiers_export' do
       it 'include_infos_administration (so it includes avis, champs privés)' do
-        expect(ActiveStorage::DownloadableFile).to receive(:create_list_from_dossiers).with(dossiers: anything, user_profile: instructeur).and_return([])
+        expect(ActiveStorage::DownloadableFile).to receive(:create_list_from_dossiers).with(dossiers: anything, user_profile: instructeur, export_template:).and_return([])
         subject
       end
-    end
 
-    context 'with files (and http calls)' do
-      let!(:dossier) { create(:dossier, :accepte, :with_populated_champs, :with_individual, procedure: procedure) }
-      let(:dossier_exports) { PiecesJustificativesService.new(user_profile: instructeur).generate_dossiers_export(Dossier.where(id: dossier)) }
-      before do
-        allow_any_instance_of(ActiveStorage::Attachment).to receive(:url).and_return("https://opengraph.githubassets.com/d0e7862b24d8026a3c03516d865b28151eb3859029c6c6c2e86605891fbdcd7a/socketry/async-io")
+      context 'with export_template' do
+        let!(:dossier) { create(:dossier, :accepte, :with_populated_champs, :with_individual, procedure: procedure) }
+        let(:dossier_exports) { PiecesJustificativesService.new(user_profile: instructeur, export_template:).generate_dossiers_export(Dossier.where(id: dossier)) }
+        let(:export_template) { create(:export_template, groupe_instructeur: procedure.defaut_groupe_instructeur).tap(&:set_default_values) }
+        before do
+          allow_any_instance_of(ActiveStorage::Attachment).to receive(:url).and_return("https://opengraph.githubassets.com/d0e7862b24d8026a3c03516d865b28151eb3859029c6c6c2e86605891fbdcd7a/socketry/async-io")
+        end
+
+        it 'returns a blob with custom filenames' do
+          VCR.use_cassette('archive/new_file_to_get_200') do
+            subject
+            File.write('tmp.zip', subject.download, mode: 'wb')
+            File.open('tmp.zip') do |fd|
+              files = ZipTricks::FileReader.read_zip_structure(io: fd)
+              base_fn = "export"
+              structure = [
+                "#{base_fn}/",
+                "#{base_fn}/dossier-#{dossier.id}/",
+                "#{base_fn}/dossier-#{dossier.id}/piece_justificative-#{dossier.id}.txt",
+                "#{base_fn}/dossier-#{dossier.id}/export_#{dossier.id}.pdf"
+              ]
+              expect(files.size).to eq(structure.size)
+              expect(files.map(&:filename)).to match_array(structure)
+            end
+            FileUtils.remove_entry_secure('tmp.zip')
+          end
+        end
       end
 
-      it 'returns a blob with valid files' do
-        VCR.use_cassette('archive/new_file_to_get_200') do
-          subject
+      context 'with files (and http calls)' do
+        let!(:dossier) { create(:dossier, :accepte, :with_populated_champs, :with_individual, procedure: procedure) }
+        let(:dossier_exports) { PiecesJustificativesService.new(user_profile: instructeur, export_template: nil).generate_dossiers_export(Dossier.where(id: dossier)) }
+        before do
+          allow_any_instance_of(ActiveStorage::Attachment).to receive(:url).and_return("https://opengraph.githubassets.com/d0e7862b24d8026a3c03516d865b28151eb3859029c6c6c2e86605891fbdcd7a/socketry/async-io")
+        end
 
-          File.write('tmp.zip', subject.download, mode: 'wb')
-          File.open('tmp.zip') do |fd|
-            files = ZipTricks::FileReader.read_zip_structure(io: fd)
-            base_fn = 'export'
-            structure = [
-              "#{base_fn}/",
-              "#{base_fn}/dossier-#{dossier.id}/",
-              "#{base_fn}/dossier-#{dossier.id}/pieces_justificatives/",
-              "#{base_fn}/dossier-#{dossier.id}/#{ActiveStorage::DownloadableFile.timestamped_filename(ActiveStorage::Attachment.where(record_type: "Champ").first)}",
-              "#{base_fn}/dossier-#{dossier.id}/#{ActiveStorage::DownloadableFile.timestamped_filename(dossier_exports.first.first)}"
-            ]
-            expect(files.size).to eq(structure.size)
-            expect(files.map(&:filename)).to match_array(structure)
+        it 'returns a blob with valid files' do
+          VCR.use_cassette('archive/new_file_to_get_200') do
+            subject
+
+            File.write('tmp.zip', subject.download, mode: 'wb')
+            File.open('tmp.zip') do |fd|
+              files = ZipTricks::FileReader.read_zip_structure(io: fd)
+              base_fn = 'export'
+              structure = [
+                "#{base_fn}/",
+                "#{base_fn}/dossier-#{dossier.id}/",
+                "#{base_fn}/dossier-#{dossier.id}/pieces_justificatives/",
+                "#{base_fn}/dossier-#{dossier.id}/#{ActiveStorage::DownloadableFile.timestamped_filename(ActiveStorage::Attachment.where(record_type: "Champ").first)}",
+                "#{base_fn}/dossier-#{dossier.id}/#{ActiveStorage::DownloadableFile.timestamped_filename(dossier_exports.first.first)}"
+              ]
+              expect(files.size).to eq(structure.size)
+              expect(files.map(&:filename)).to match_array(structure)
+            end
+            FileUtils.remove_entry_secure('tmp.zip')
           end
-          FileUtils.remove_entry_secure('tmp.zip')
         end
       end
     end