Adding a +1 for this feature.
Currently I'm mostly using this device to get around Mac restrictions on signed apps for virtual wallpapers. While Zoom and others have resolved their problems with virtual cameras, its so much easier to chroma key outside of OBS and just have it show up as a UVC camera on a Mac.
My workaround currently, I bought a cheap 'digital signage' HDMI out device that takes an SD card with media on it. You can use the remote control to change images, or have it auto started up to loop a video. I have that on 'camera 2' and use that as the background. So basically, bought an entirely second device to account for two issues:
1. Mini Pro won't save a couple of jpgs and have to be replaced when booted
2. Mino Pro can't load videos from media player (I have a subtle background that has video in it).
While this worked, and you can build a digital signage media thing that works out of a Raspberry Pi for super cheap.. it does seem like something the Mini Pro could do built-in.
I love this device, and think every Twitch and Youtube streamer should have this thing on their desk.. adding in a way to mount files (For me, it would need to be in built-in flash, I need the USB-C port for the UVC function) would be a great step, and.. if there was a way to power it off without unplugging it.. so it's not baking on my desk all night.
I haven't tried it, but assuming that you could script the uploads using Ian Morrish's tools, which are Windows Powershell.
https://ianmorrish.wordpress.com