Don't see an option for e2ee encryption after upgrade to NC13

Acoding the Youtube tutorial, an option to encrypt a folder e2e should just appear after upgrading to NC13. I do not see such an optoin in any of the clients: Android/Linux (all upgraded to latest versions). Is any additional installation required on the server side? Could it be a client problem?

all upgraded to latest versions

Can you post the version numbers of both clients, just to be sure.

In the Android client, when you created a folder, and you click on the three “…” on the right, there should be an option “Set as encrypted”. Android client v3.0.1.

As for the desktop client, make sure you got the prerelease:

Android version 3.0.0. The latest non-dev available on F-Droid