Preconditions: created content type with textline (marked as required) and image, media and file (all three not required)
Steps:
1. Click on Create and choose content type from preconditions
2. Fill textline, put a film into media field (do not switch on the switches and do not fill width and height)
3. Click Publish - there is error 400
If you switch on the switches and fill width and height there will no problem with publishing.