I think I've found my new Google suite #opensource replacement in Proton. Might cost a little more for the pro features but the benefits seem worth it.
I was trying out NextCloud but the OnlyOffice functionality on mobile was a little clunky. I've still to properly test Proton Drive but it seems promising.

@denmanrooke I only have two negatives on NextCloud, encryption isn't great and the Office like tools are tetchy and have embarassed me hard in interviews.

I also have Proton Drive, which is a great concept, but it is super beta right now. They're looking good at where they're trying to get to, but right now it is mega clunk with no sync apps readily available

@kc ah thanks! Yeah still digging around to try and find something good.

@denmanrooke It'll be worth testing out Jottacloud if you haven't yet, I think it is NextCloud but the integration with Microsoft Office Online might be a better experience until Proton comes up with their new version of Drive

https://www.jottacloud.com/en/features/

Jottacloud

Jottacloud - Cloud storage made easy

@kc I'd never heard of #jotta seems reasonably priced:)