Nextcloud 19 support

[wizdude]

nextcloud hub 19 has some exciting new features and we want to move across with apps tested and validated. many thanks for your great work to date!

[neilsimp1]

I'm running Nextcloud 19.0.3, is this why I am getting stuck trying to sync from the desktop and Android apps?

Nextcloud 19.0.3
Joplin Web API 0.0.25
Joplin for Desktop 1.0.245
Joplin for Android 1.0.339

I am unable to sync from any device and get stuck at this screen:

Joplin upgrade in progress...
Please wait while the sync target is being upgraded. It may take a few seconds or a few minutes depending on the upgrade. The application will automatically restart once it is completed.

I am able to activate the Joplin Web API app in Nextcloud unlike some other issues I've noticed here but I guess it's not working?
Do I need to downgrade my Nextcloud?