Nextcloud

So the title says it all but I have an annoying bug (?). If I send invites for an event to users out of nextcloud they receive the event and can respond to it. But if they select yes/no/… the status of the invite does not change. I receive a confirmation from their gmail that they accepted the invite.

I use nextcloud on unraid using docker. Mails are being send using iCloud. Nextcloud is using an external domain via Nginx proxy manager and cloudflare.

Tips, ideas where to look?

Could somebody direct me to a server that has Collabora working, and maybe 1TB-2TB of disk space? Thanks.

The only thing I found is creating a dedicated instance on a cloud server like Hetzner (expensive and I would need to maintain it).

I'm looking to convert my data from nextcloud turnkey lxc container to a standard docker docker container.

What's the best way to go about this?

Edit:

I just exported my data manually and then reimported. It was almost pain free if I hadn't tried to upgrade from 25 to 27