Saw your post. I'd recommend not using Garnet. I tried it out before because I liked the idea of the Monero folks having their own client. It hasn't been updated since July. Ametheyst, which Garnet is a fork of, has been updated a bazillion times since then so Garnet is missing out on a lot of fixes.
Discussion
Okay. I managed to get mostard working so will probably just run that on desktop for now and watch for either updates or another mobile client. I'm intrigued by using both BTC and XMR together, and I'm just trying to learn more about privacy on top of my daily stuff