Including disabling iCloud for the app, deleting all associated iCloud data, reinstalling multiple times, restarting the phone multiple times, etc.
But nothing helped. This is very frustrating as I purchased Obsidian Sync specifically to be able to use it on my phone (and “Seamlessly work across Mac, Windows, Linux, iOS and Android.” is an explicit part of the marketing pitch for this paid service, and it is not true).
I don’t see how it can be the themes. I have never even logged in on mobile yet so how could it be trying to load my themes and plugins from the desktop? How could it be an operating system issue when it’s just iOS? It is a very closed system