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A short description of the issue:
When calling batchCreate with multiple media items, the media items show up in the Google Photos App in randomized orders.

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:\"$UPLOAD_TOKEN1\"}}, {simple_media_item: {upload_token:\"$UPLOAD_TOKEN2\"}}, {simple_media_item: {upload_token:\"$UPLOAD_TOKEN3\"}}]}"
  $LIB_URL/mediaItems:batchCreate

What steps will reproduce the problem?
1. Create multiple upload tokens
2. Create media items in an album
3. Repeat

What is the expected output? What do you see instead?  If you see error messages, please provide them.
Sometimes the order of the media items are in the order that they were uploaded, sometimes they're randomized.

Expect to see it in the same order they were uploaded every time.

Please provide any additional information below.