Sorry to hear you’re facing problems
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Nextcloud version (eg, 20.0.5): 21.0.3
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.2
Apache or nginx version (eg, Apache 2.4.25): 2.4.41-4ubuntu3.3
PHP version (eg, 7.4): 7.5
Android client version: 30160190
I’ve been hit by the bug here: Parameter specified as non-null is null · Issue #8370 · nextcloud/android · GitHub
It happened when I upgraded my server to Nextcloud 20, and persisted after upgrading to 21. Rolling back to pre-20 seems like a really bad thing to try.
Can I find older APKs for the Android client? Some info on github indicates that the 3.15 version still works.