Just updated from 7.1 to the latest shipping of the open-source version. Thought could be an issue with that version I was running but no luck yet.
Everything seems to work fine with the default size cap of around 10MB. Increased that on "global settings" on a config that was already built for 7.1. The web interface recognises this increased limit but even if I try to upload something beyond 10MB, can't be processed.
Can't find a server specific setting either.