Does Syncthing have something like a "file source"?

Feature
1

What I would like to do is explain to Syncthing that my phone will create new files (photos that I take) and that it should receive those files, but when I delete them on my phone they shouldn’t be deleted anywhere else.

So, it’s not receive-only (which also receives deletes) but somehow more fine-grained. It would have to be receive-only-creates or something.

I guess it doesn’t exist and the workaround is to use file versioning somehow, right?

2

Yes, that is not an intended use case. If you feel adventurous, there is an advanced option to ignore deletes in a folder, but it’s more of an anti-feature and not well supported.

3

… and the folder will permanently indicate status “Out of sync”.