Google has been blocking storage access on /storage/emulated/0 or /sdcard/ for a bit now in the name of "safety". If the app requests root permissions (and you're rooted ofc) you can bypass this restriction
Syncthing
Syncthing is a continuous file synchronization program. It synchronizes files between two or more computers in real time, safely protected from prying eyes.
Your data is your data alone and you deserve to choose where it is stored, whether it is shared with some third party, and how it's transmitted over the internet.
Visit https://syncthing.net/ for more information, downloads and donations
If I'm on Graphene, l guess this shouldn't be a problem (it hasn't so far).
Are you using the app from Google Play or F-Droid? I don't use syncthing but I think that rule is enforced by the play store and not Android (see recent Nextcloud issue)
It's F-Droid!
It shouldn't need to comply with that restriction then, but the devs may make it to simplify the code base between the two versions
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Fork won't let me edit the folder paths, so it looks like I'll have to start all over again, which is annoying but not the end of the world. Guess I'll be setting FDroid to not update apps automatically, but even so I probably would not have noticed (or understood) the change in the release notes.