Hey,
I've tried to install both the OC plugin following this tutorial and NC plugin following this guide on OMV4. Sadly, in both cases I wasn't succesful. Actually in both cases it seem to be some issue with different php-versions between OMV4 (which I used) and OMV2/3 which were used within the aforementioned tutorials - however, I'm a bloody OMV and Linux beginner, and, therefore cannot fix or even identify the exact problem by myself.
I couldn't find a thread or discussion on installing a cloud plugin on OMV4, but maybe I've overlooked something? Or is it just not possible to install a cloud plugin on OMV4 at the actual development state?
Cheers,
Trillitralli