Best file sharing/syncing for long distance music recordings

Hi all! My friends and I are hoping to continue writing and recording music though we live very far apart now. We all use MacBooks for recording tracks, and I was curious if anyone has a good way to share/sync our recordings with each other.

Years ago I used Resilio Sync without much fuss, though I'd lean more towards Syncthing now. I have a always-on and internet-connected home Linux server. Thanks for any suggestions!

Edit: I forgot to mention my buddies are not techy types, so ease-of-use on their end is an important feature.