--- a/src/pyams_content/component/gallery/file.py	Wed May 30 11:23:41 2018 +0200
+++ b/src/pyams_content/component/gallery/file.py	Wed May 30 15:13:25 2018 +0200
@@ -48,9 +48,9 @@
 class GalleryFile(Persistent, Contained):
     """Gallery file info"""
 
+    _data = FileProperty(IGalleryFile['data'])
     title = FieldProperty(IGalleryFile['title'])
     alt_title = FieldProperty(IGalleryFile['alt_title'])
-    _data = FileProperty(IGalleryFile['data'])
     description = FieldProperty(IGalleryFile['description'])
     author = FieldProperty(IGalleryFile['author'])
     author_comments = FieldProperty(IGalleryFile['author_comments'])

--- a/src/pyams_content/component/gallery/interfaces/__init__.py	Wed May 30 11:23:41 2018 +0200
+++ b/src/pyams_content/component/gallery/interfaces/__init__.py	Wed May 30 15:13:25 2018 +0200
@@ -44,6 +44,10 @@
 class IGalleryFile(IGalleryItem):
     """Gallery file marker interface"""
 
+    data = MediaField(title=_("Image or video data"),
+                      description=_("Image or video content"),
+                      required=True)
+
     title = I18nTextLineField(title=_("Legend"),
                               required=False)
 
@@ -51,10 +55,6 @@
                                   description=_("Alternate title used to describe media content"),
                                   required=False)
 
-    data = MediaField(title=_("Image or video data"),
-                      description=_("Image or video content"),
-                      required=True)
-
     description = I18nTextField(title=_("Description"),
                                 required=False)
 

--- a/src/pyams_content/component/gallery/zmi/interfaces.py	Wed May 30 11:23:41 2018 +0200
+++ b/src/pyams_content/component/gallery/zmi/interfaces.py	Wed May 30 15:13:25 2018 +0200
@@ -33,6 +33,10 @@
 class IGalleryMediasAddFields(Interface):
     """Gallery medias add fields"""
 
+    medias_data = FileField(title=_("Images or videos data"),
+                            description=_("You can upload a single file or choose to upload a whole ZIP archive"),
+                            required=True)
+
     author = TextLine(title=_("Author"),
                       description=_("Name of document's author"),
                       required=False)
@@ -40,7 +44,3 @@
     author_comments = I18nTextField(title=_("Author comments"),
                                     description=_("Comments relatives to author's rights management"),
                                     required=False)
-
-    medias_data = FileField(title=_("Images or videos data"),
-                            description=_("You can upload a single file or choose to upload a whole ZIP archive"),
-                            required=True)