Hiya butter,
You should be able to access any videos with the .tsv extension on the SD Card using a Tiny Arcade with the "Video Player" option. This menu option is included in the "All Games" .zip fille found on multiple pages where you can download all the Tiny games, like here:
https://learn.tinycircuits.com/Kits/Tiny-Arcade-All-Games/There should be a "Video Player" folder in this zip file which should be moved to the SD Card, I attached a zip of this folder so you can see how it looks, or download it directly.
Then you can scroll through the Tiny Arcade games to the "Video Player" option. Select the Video Player like you would any game, and then you will have a scroll menu of all the .tsv extension videos available on the SD Card. Select a video to play it. You should be able to fast forward and rewind with the joystick, and then you can pause/play using the select button, and you can exit the video file using the other button.
You will need the SD Card for this, as the most the processor memory could hold in terms of video would be a few seconds - which is not very useful.
In answering this post, I've realized there is no formal documentation on this process - so I will look into where I can add this info for anyone else with the same question. Thanks for bringing this to our attention!
I hope that helps, let me know if you have any other questions!
Thanks,
RĂ©na