Is it possible to use /e cloud to sync documents with laptop ? I’m using it to sync files
with my Gigaset phone but it would be nice to have laptop synced as well in case it breaks.
Is there a bridge software for it ? I’m using Ubuntu.
Feedback is much appreciated.
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services
Yes, use nextcloud desktop client 
The built-in manager doesn’t allow some apps to access and save, so use the actual desktop client
Syncthing also covers the usecase phone<>laptop pretty well, no space restrictions, full bandwidth, but a bit of configuration. There are howtos for it in the forum.
A more userfriendly Syncthing, installed by default, conservatively configured for network local sync only would help a lot of people avoid cloud subscriptions. Admittedly it doesnt cover the full utility as Dropbox (sharing, idea of users, offsite backup) though, but is great for your own devices