Revision Queue is empty

Howdy,

I have a simple single site with very few plugins, and I’m trying PublishPress Revision.

However, the Revision Queue is always empty, no matter what.

I have tried to create posts and pages as Contributor, Revisor and a custom role, for Pages and 2 custom post types. No matter what, the revision queue remains empty.

What are the exact capabilities a role should have for PublishPress Revision to work?

Also, can you give me an example snippet for a compatible custom post type? Should I add anything special to the “supports” array key, for instance?

Looking forward for some help,
Thanks,
Lucas