Issue #2818155 by Yogesh Pawar, edgewl2: Add comments to d6_file stating the conflicts with d6_user_picture_file

core/modules/file/migration_templates/d6_file.yml

@@ -13,6 +13,9 @@ source:
     # configuration in this migration's process pipeline as an example.
     source_base_path: ''
 process:
+    # If you are using both this migration and d6_user_picture_file in a custom
+    # migration and executing migrations incrementally, it is recommended that
+    # you remove the fid mapping here to avoid potential ID conflicts.
   fid: fid
   filename: filename
   source_full_path:

core/modules/user/migration_templates/d6_user_picture_file.yml

@@ -11,6 +11,9 @@ source:
     # table are specified, and must end with a /.
     source_base_path: ''
 process:
+    # If you are using both this migration and d6_file in a custom migration
+    # and executing migrations incrementally, it is recommended that you
+    # remove the fid mapping from d6_file to avoid potential ID conflicts.
   filename: filename
   uid: uid
   source_full_path: