Preconditions: Content type with textline (required) and image, media i file (not required)
Steps:
1.Go to Create content item with content type from preconditions
2. Fill in textline,
3. Drag and drop for ex. mp4 file to the media field, do not fill width and height
4. Click Publish - there is an error 400.
If you fill width and height, content item will be published well.