demarches-normaliennes/app/views/active_storage/blobs/_blob.html.erb

<% if blob.representable? %>
  <% representation = blob.representation(resize_to_limit: local_assigns[:in_gallery] ? [ 800, 600 ] : [ 1024, 768 ]) %>
  <% if representation.image&.attached? || representation.key.present? %>
    <figure class="attachment attachment--preview attachment--<%= blob.filename.extension %>">
      <%= image_tag representation %>
    <% else %>
    <figure class="attachment attachment--file attachment--<%= blob.filename.extension %>">
      <%= image_tag blob %>
    <% end %>
    </figure>
      <figcaption class="attachment__caption">
        <% if caption = blob.try(:caption) %>
          <%= caption %>
        <% else %>
          <span class="attachment__name"><%= blob.filename %></span>
          <span class="attachment__size"><%= number_to_human_size blob.byte_size %></span>
        <% end %>
      </figcaption>
<% end %>