Yes, it replaces the old version, and use the existing config automatically.
Updates to new beta versions can be done from F-Droid or Github. Updates to release versions from F-Droid or Google Play. Note that F-Droid APKs are signed with a different key, and can’t be installed directly over Github/Google Play APKs.
Where should I send bug reports? I installed on both my android devices, updated desktop version to latest 0.12 build and it looked fine. Tryed using relays (connect and sync through 3G network of one of the devices( which did not work before)) and it worked. But after some hours both devices have strange behaviour. On S5 syncthing works (copying file to synced folder sends it to PC) but Syncthing-androiid crashes on start(even after a phone restart). On S3 (running latest CyanogenMod) Syncthing-android works until I select “settings” and then it crashes. Any hints and how can I help track this problem?
Trying today, seems a bit slow to start, sometimes syncthing connects to others and wrapper still shows “loading”, but after a while (much longer than old versions) it starts.
In “devices” all shows “up to date” immediately after first connects to it, even for those who are not running, also when showing “syncing (xy%)” its same for all in device list (will create issue for this).