Upstream sync

app/controllers/api/releases_controller.rb

@@ -45,13 +45,14 @@ class Api::ReleasesController < Api::ApiController
     if model_name == "acquired_media_release"
       mapping = {
         "#{model_name.camelize}": SerializableAcquiredMediaRelease,
-        FileInfo: SerializableFileInfo
+        FileInfo: SerializableFileInfo,
+        "ActiveStorage::Attachment".to_sym => ActiveStorage::SerializableAttachment,
       }
 
       render jsonapi: release,
            status: status,
            class: mapping,
-           include: [:file_infos]
+           include: [:files, :file_infos]
     else
       mapping = {
         "#{model_name.camelize}": show_serializable,