Nextcloud Full Sync Android Client

I use Nextcloud for a while.
My clients are on Ubuntu and Android.
The data on the Ubuntu-Client is a full sync (using the Desktop-App).
The local data on the Android-Client isn’t complete.
Is it possible to force the Android-Clients having the data in the Nextcloud complete local?
Is it possible to push the data from the Nextcloud at any change to the Android-Clients?
With other words: Automatic bidirectional Sync between NC and the android-client …