Oh this is awesome, thanks for the Tux’s

Edit: I think they are lower resolution than the source image

I just use syncthing and set up the appropriate send /receive permissions for each folder

When I want to access those files remotely, I just sftp / ssh into the server. (Someone more knowledgeble than me can help you with that part, I just install Tailscale on my devices for remote ssh)

sure it may not be elegant, but is pretty easy to maintain in the long run (see complaints about updating / setting up nextcloud in this thread)

maybe this will help with setup. Note he is doing bidirectional sync, but one way sync works too:

https://www.youtube.com/watch?v=dBVTedUWbfg

edit: forgot to mention, this is cross platform across Mac, Windows, Android, and Linux. Not sure about iOS