Recommended Syncthing mobile app for Android is not on either app store.

Syncthing mobile on Google Play and F-Droid are both giving 404 errors now.

F-Droid has an alternative that I've installed https://f-droid.org/packages/com.nutomic.syncthingandroid

\>License: Mozilla Public License 2.0

I'm running it - it appears to be working.