@KenQB welcome and thanks for your request 
could you be clear about your setup? please complete the support template so that folks here have the necessary information to be able to help you.
also be clear whether you use the Nextcloud Android client or the Note app standalone and how you have configured your login method, two-factor authentication or device password.
using GrapheneOS on pixel 8 personally and have no issues whatsoever, also LineageOS on Moto G7 works perfectly, so the app itself is presumably not the issue, neither is AOSP nor phone hardware.