Photo sharing app

This a quick one, I've had a search on google and f-droid.
I'm after an app, that allows me to share photos/videos with family fully uncompressed and encrypted, directly, no server required (if possible). Similar to any messaging app like signal but unhindered.
I'm a photographer and print often, so when family send me images, they tend to be very compressed via whatsapp/signal etc.
I do ask them to email them instead but lets say, for sheer simplicity most find messaging apps easier/less lazy to use.
I do have a homelab/truenas server, so perhaps I could use that to host something and them give all my people an app?
Any thoughts, thanks.