My experience with the Nextcloud Android app is that the automatic sync is quite limited (eg. https://github.com/nextcloud/android/issues/757, https://github.com/nextcloud/android/issues/19). Every change has to be manually synced by opening the app and navigating to the Sync option for each file. This is pretty much a dealbreaker for me, but it looks like a lot of people are using Nextcloud successfully. So I'm curious how your usage differs from mine - do you only use it for static unchanging files that don't need to be synchronized that often, or is the sync situation smoother on other devices?