It appears from a Chris answer to a Micro SD card slot question that the Edith Keeler imagery is using the MJPEG format (M standing for Motion).
Admittedly…I have yet to bust open my Tricorder’s to touchy-feely. They are in my Star Trek collection tubs for now. I’m short on space and have to rotate my collection’s.
Anyway….In preparation for the possibility that a software upgrade may allow to use the micro SD card slot to play files….video, audio, still images, etc….. I’ve already managed to put together the entire ST series, Animated series, and Movies (7) in an MP4 format at a 320x240 resolution. The quality is just fine for me, imo. It all presently fits on a 32Gb Micro SD Card.
I’m hoping for the MP4 format in addition to the already loaded MJPEG format. Although if necessary, I’ll use an MP4 to MJPEG converter. MP4 is widely used….even over other format’s like AVI etc.
I was going to test the Micro SD card slot with different file formats to see if one or more gets recognized and shows the inserted card indicator changing in the Engineering status ….. but I’m lazy and not ready to break out my Tricorder’s.
Since the world doesn’t wait on me

….. I’m sure someone will test it and report on it…somewhere, if not on this forum.
Peace