There are many options.
I have been looking into this for other reasons: https://codeberg.org/shroff/phylum but it might do the trick for you.
Or this one: https://www.filestash.app/
These are client apps for storing? I'm just looking for client software not server.
I don't really get what you mean. These are clients that connect to a S3 storage.
Thank you so much for your suggestions, I've been wanting to remove the whole Nextcloud setup for a more reasonable alternative. Gotta try phylum.
RClone maybe? https://rclone.org/
There are some open source rclone android apps like RCX, and on windows/linux you can just use rclone mount to use it like a normal filesystem.
You could install Nextcloud on the VPS, configure Nextcloud to store things in S3, and use Nextcloud's apps on the clients. And have Nextcloud provide webdav services and use your client OSs native webdav tooling.
I'm not looking for a VPS/VM. Just bucket storage for my local client to connect to its API.
Good to know that's possible though!
If your VPS’ S3 supports tokenized urls for object management, I’ve considered setting up a homebrew Dropbox-like solution using rsync and cron.
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out: