I use Obsidian git on PC, and this workaround (since the plugin doesn't support mobile) to seamlessly* sync my notes to and from my phone. Using these instructions you create an automation for pulling every time you open Obsidian, and pushing every time you close it.
* you can still get merge conflicts...
Merge conflicts are not handled and will prevent pushing and pulling. Basically just make sure you only work on your repository from one device at a time.