Problem:
This was encountered during "Add an image" testing
- Video files are not displayed well in the image inspector
- Full screen image viewer breaks on videos (the video does not play, but instead a small "image" icon is shown).
Proposed solution
Part 1. Show a still frame of the video with a play icon on top in the image inspector to indicate it is a video file.
Part 2. If the user selected the "full screen" view on a video file, load the video file page and it leave it to the device/browser support to play the specific video file type.