Hello gus_massa, Jitsi seems to not have file sharing between participants and the collaborative whiteboard. What do you think about it?
I'm in charge of a dozen of T.A. in the university, and for the virtual Math clases each has been using Zoom/Meet/Teams/Jitsi. (I actually don't remember if someone used Jitsi for the clases.) The T.A. have a very strong opinion about which one is the best, and one of the reasons is the whiteboard support.