The plugin does everything for you! https://github.com/vrtmrz/obsidian-livesync

I self host a couchdb container and use a Cloudflare tunnel to forward it to a subdomain. I then use the self hosted live sync plugin in Obsidian and it is perfect. So much better than so many of the other options like Joplin and Memos (tried both and wasn’t a fan). It works perfectly on the desktop app, iOS, and android.