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A short description of the issue:
If the user is the owner of a shared album and batchCreate is called to add media items to the shared album, the position field is ignored, and all media items are added to the end of the album (as per the default if position is not set)

Your project number from the Google Developers Console:
N/A

The calls to the API that lead to the error. Include the sequence of calls, including request headers and body.
Do not include any personal information, authentication secrets, media item or album IDs.
curl -H "Content-type: application/json"
  -H "Authorization: Bearer $OAUTH_TOKEN"
  -X POST \
  -d "{album_id:\"$ALBUM\", new_media_items:[{simple_media_item: {upload_token:\"$UPLOAD_TOKEN1\"}}], albumPosition: {position: \"AFTER_MEDIA_ITEM\", relative_media_item_id: \"$MEDIA_ITEM\"}}" \
  $LIB_URL/mediaItems:batchCreate


What steps will reproduce the problem?
1. Call batchCreate on a shared album as the owner of the album. Add in a valid position field.

What is the expected output? What do you see instead?  If you see error messages, please provide them.
Expect to see the newly created media items after the specified media item ($MEDIA_ITEM in the sample above)

Currently the newly created media item is just added to the end of the album.

Please provide any additional information below.