Essentially looking for a shared drive that family members or friends can upload files to without having to make individual users / accounts Anyone know a good way to do this (self hosted or another service if Foss / private)
Have you checked out NextCloud?
Another solution might be setting up Syncthing on all your computers. It would present as a folder on the local systems and anything put in there would be synced to the other systems. No logins required.
https://docs.nextcloud.com/server/latest/user_manual/en/files/file_drop.html
Might be what you’re looking for?
Nextcloud is a nice centralized system for that, you can setup shared folders that appear as a weblink that anyone can upload to, but it would require someone (likely you) to set up and maintain a LAMP stack application.
Otherwise if you want a simpler “share files between PCs” kind of application then Syncthing would be great for that. Install it on both PCs, link them, then setup a shared folder. The contents of that folder are then mirrored between the pcs.
I wouldnt do it without a login even on a LAN
