diff --git a/app/controllers/instructeurs/dossiers_controller.rb b/app/controllers/instructeurs/dossiers_controller.rb
index 2f4540d52..575b3d0e4 100644
--- a/app/controllers/instructeurs/dossiers_controller.rb
+++ b/app/controllers/instructeurs/dossiers_controller.rb
@@ -18,6 +18,7 @@ module Instructeurs
     after_action :mark_messagerie_as_read, only: [:messagerie, :create_commentaire, :pending_correction]
     after_action :mark_avis_as_read, only: [:avis, :create_avis]
     after_action :mark_annotations_privees_as_read, only: [:annotations_privees, :update_annotations]
+    after_action :mark_pieces_jointes_as_read, only: [:pieces_jointes]
 
     def extend_conservation
       dossier.extend_conservation(1.month)
@@ -466,6 +467,10 @@ module Instructeurs
       current_instructeur.mark_tab_as_seen(dossier, :annotations_privees)
     end
 
+    def mark_pieces_jointes_as_read
+      current_instructeur.mark_tab_as_seen(dossier, :pieces_jointes)
+    end
+
     def aasm_error_message(exception, target_state:)
       if exception.originating_state == target_state
         "Le dossier est déjà #{dossier_display_state(target_state, lower: true)}."
diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index 824751910..b7166d911 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -341,7 +341,10 @@ module Users
       @commentaire = CommentaireService.create(current_user, dossier, commentaire_params)
 
       if @commentaire.errors.empty?
-        @commentaire.dossier.update!(last_commentaire_updated_at: Time.zone.now)
+        timestamps = [:last_commentaire_updated_at, :updated_at]
+        timestamps << :last_commentaire_piece_jointe_updated_at if @commentaire.piece_jointe.attached?
+
+        @commentaire.dossier.touch(*timestamps)
 
         flash.notice = t('.message_send')
         redirect_to messagerie_dossier_path(dossier)
diff --git a/app/models/concerns/dossier_clone_concern.rb b/app/models/concerns/dossier_clone_concern.rb
index 691226c0e..6d7b185e4 100644
--- a/app/models/concerns/dossier_clone_concern.rb
+++ b/app/models/concerns/dossier_clone_concern.rb
@@ -71,6 +71,7 @@ module DossierCloneConcern
       diff = make_diff(editing_fork)
       apply_diff(diff)
       touch(:last_champ_updated_at)
+      touch(:last_champ_piece_jointe_updated_at) if diff[:updated].any? { |c| c.class.in?([Champs::PieceJustificativeChamp, Champs::TitreIdentiteChamp]) }
     end
     reload
     index_search_terms_later
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 9a980ae60..f6707f444 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -377,7 +377,9 @@ class Dossier < ApplicationRecord
       ' OR groupe_instructeur_updated_at > follows.demande_seen_at' \
       ' OR last_champ_private_updated_at > follows.annotations_privees_seen_at' \
       ' OR last_avis_updated_at > follows.avis_seen_at' \
-      ' OR last_commentaire_updated_at > follows.messagerie_seen_at')
+      ' OR last_commentaire_updated_at > follows.messagerie_seen_at' \
+      ' OR last_commentaire_piece_jointe_updated_at > follows.pieces_jointes_seen_at' \
+      ' OR last_champ_piece_jointe_updated_at > follows.pieces_jointes_seen_at')
       .distinct
   end
 
diff --git a/app/models/follow.rb b/app/models/follow.rb
index c494eb47d..7c2dcaed2 100644
--- a/app/models/follow.rb
+++ b/app/models/follow.rb
@@ -18,5 +18,6 @@ class Follow < ApplicationRecord
     self.annotations_privees_seen_at ||= Time.zone.now
     self.avis_seen_at ||= Time.zone.now
     self.messagerie_seen_at ||= Time.zone.now
+    self.pieces_jointes_seen_at ||= Time.zone.now
   end
 end
diff --git a/app/models/instructeur.rb b/app/models/instructeur.rb
index b9e105802..6c9f388af 100644
--- a/app/models/instructeur.rb
+++ b/app/models/instructeur.rb
@@ -125,10 +125,11 @@ class Instructeur < ApplicationRecord
       annotations_privees = dossier.last_champ_private_updated_at&.>(follow.annotations_privees_seen_at) || false
       avis_notif = dossier.last_avis_updated_at&.>(follow.avis_seen_at) || false
       messagerie = dossier.last_commentaire_updated_at&.>(follow.messagerie_seen_at) || false
+      pieces_jointes = dossier.last_champ_piece_jointe_updated_at&.>(follow.pieces_jointes_seen_at) || dossier.last_commentaire_piece_jointe_updated_at&.>(follow.pieces_jointes_seen_at) || false
 
-      annotations_hash(demande, annotations_privees, avis_notif, messagerie)
+      annotations_hash(demande, annotations_privees, avis_notif, messagerie, pieces_jointes)
     else
-      annotations_hash(false, false, false, false)
+      annotations_hash(false, false, false, false, false)
     end
   end
 
@@ -314,12 +315,13 @@ class Instructeur < ApplicationRecord
 
   private
 
-  def annotations_hash(demande, annotations_privees, avis, messagerie)
+  def annotations_hash(demande, annotations_privees, avis, messagerie, pieces_jointes)
     {
       demande: demande,
       annotations_privees: annotations_privees,
       avis: avis,
-      messagerie: messagerie
+      messagerie: messagerie,
+      pieces_jointes: pieces_jointes
     }
   end
 
diff --git a/app/views/instructeurs/dossiers/_header_bottom.html.haml b/app/views/instructeurs/dossiers/_header_bottom.html.haml
index 0358c4aa0..1af884845 100644
--- a/app/views/instructeurs/dossiers/_header_bottom.html.haml
+++ b/app/views/instructeurs/dossiers/_header_bottom.html.haml
@@ -9,7 +9,8 @@
 
       - if dossier.champs.map(&:piece_justificative_file).flatten.any?
         = dynamic_tab_item(t('views.instructeurs.dossiers.tab_steps.attachments'),
-          pieces_jointes_instructeur_dossier_path(dossier.procedure, dossier))
+          pieces_jointes_instructeur_dossier_path(dossier.procedure, dossier),
+          notification: notifications_summary[:pieces_jointes])
 
       = dynamic_tab_item(t('views.instructeurs.dossiers.tab_steps.private_annotations'),
         annotations_privees_instructeur_dossier_path(dossier.procedure, dossier),
diff --git a/spec/models/concerns/dossier_clone_concern_spec.rb b/spec/models/concerns/dossier_clone_concern_spec.rb
index e7e5f4869..dd33470ab 100644
--- a/spec/models/concerns/dossier_clone_concern_spec.rb
+++ b/spec/models/concerns/dossier_clone_concern_spec.rb
@@ -44,7 +44,9 @@ RSpec.describe DossierCloneConcern do
       expect(new_dossier.last_avis_updated_at).to be_nil
       expect(new_dossier.last_champ_private_updated_at).to be_nil
       expect(new_dossier.last_champ_updated_at).to be_nil
+      expect(new_dossier.last_champ_piece_jointe_updated_at).to be_nil
       expect(new_dossier.last_commentaire_updated_at).to be_nil
+      expect(new_dossier.last_commentaire_piece_jointe_updated_at).to be_nil
       expect(new_dossier.motivation).to be_nil
       expect(new_dossier.processed_at).to be_nil
     end
diff --git a/spec/models/instructeur_spec.rb b/spec/models/instructeur_spec.rb
index 54f2a21b0..9523e6779 100644
--- a/spec/models/instructeur_spec.rb
+++ b/spec/models/instructeur_spec.rb
@@ -196,7 +196,7 @@ describe Instructeur, type: :model do
     subject { instructeur.notifications_for_dossier(dossier) }
 
     context 'when the instructeur has just followed the dossier' do
-      it { is_expected.to match({ demande: false, annotations_privees: false, avis: false, messagerie: false }) }
+      it { is_expected.to match({ demande: false, annotations_privees: false, avis: false, messagerie: false, pieces_jointes: false }) }
     end
 
     context 'when there is a modification on public champs' do
@@ -205,20 +205,20 @@ describe Instructeur, type: :model do
         dossier.update(last_champ_updated_at: Time.zone.now)
       }
 
-      it { is_expected.to match({ demande: true, annotations_privees: false, avis: false, messagerie: false }) }
+      it { is_expected.to match({ demande: true, annotations_privees: false, avis: false, messagerie: false, pieces_jointes: false }) }
     end
 
     context 'when there is a modification on identity' do
       before { dossier.update(identity_updated_at: Time.zone.now) }
 
-      it { is_expected.to match({ demande: true, annotations_privees: false, avis: false, messagerie: false }) }
+      it { is_expected.to match({ demande: true, annotations_privees: false, avis: false, messagerie: false, pieces_jointes: false }) }
     end
 
     context 'when there is a modification on groupe instructeur' do
       let(:groupe_instructeur) { create(:groupe_instructeur, instructeurs: [instructeur], procedure: dossier.procedure) }
       before { dossier.assign_to_groupe_instructeur(groupe_instructeur, DossierAssignment.modes.fetch(:auto)) }
 
-      it { is_expected.to match({ demande: true, annotations_privees: false, avis: false, messagerie: false }) }
+      it { is_expected.to match({ demande: true, annotations_privees: false, avis: false, messagerie: false, pieces_jointes: false }) }
     end
 
     context 'when there is a modification on private champs' do
@@ -227,7 +227,7 @@ describe Instructeur, type: :model do
         dossier.update(last_champ_private_updated_at: Time.zone.now)
       }
 
-      it { is_expected.to match({ demande: false, annotations_privees: true, avis: false, messagerie: false }) }
+      it { is_expected.to match({ demande: false, annotations_privees: true, avis: false, messagerie: false, pieces_jointes: false }) }
     end
 
     context 'when there is a modification on avis' do
@@ -236,23 +236,34 @@ describe Instructeur, type: :model do
         dossier.update(last_avis_updated_at: Time.zone.now)
       }
 
-      it { is_expected.to match({ demande: false, annotations_privees: false, avis: true, messagerie: false }) }
+      it { is_expected.to match({ demande: false, annotations_privees: false, avis: true, messagerie: false, pieces_jointes: false }) }
     end
 
     context 'messagerie' do
       context 'when there is a new commentaire' do
-        before {
-          create(:commentaire, dossier: dossier, email: 'a@b.com')
-          dossier.update(last_commentaire_updated_at: Time.zone.now)
-        }
+        context 'without a file' do
+          before {
+            create(:commentaire, dossier: dossier, email: 'a@b.com')
+            dossier.update(last_commentaire_updated_at: Time.zone.now)
+          }
 
-        it { is_expected.to match({ demande: false, annotations_privees: false, avis: false, messagerie: true }) }
+          it { is_expected.to match({ demande: false, annotations_privees: false, avis: false, messagerie: true, pieces_jointes: false }) }
+        end
+
+        context 'with a file' do
+          before {
+            create(:commentaire, :with_file, dossier: dossier, email: 'a@b.com')
+            dossier.update(last_commentaire_updated_at: Time.zone.now, last_commentaire_piece_jointe_updated_at: Time.zone.now)
+          }
+
+          it { is_expected.to match({ demande: false, annotations_privees: false, avis: false, messagerie: true, pieces_jointes: true }) }
+        end
       end
 
       context 'when there is a new commentaire issued by tps' do
         before { create(:commentaire, dossier: dossier, email: CONTACT_EMAIL) }
 
-        it { is_expected.to match({ demande: false, annotations_privees: false, avis: false, messagerie: false }) }
+        it { is_expected.to match({ demande: false, annotations_privees: false, avis: false, messagerie: false, pieces_jointes: false }) }
       end
     end
   end