Hi Tom.
Thank you very much for your quick response and help. I would be very happy if I could manage to share individual files as you suggest. It happens that if I try to share with somebody without a plex account, when they use the link and try to accept they only get an " Hmm, an invite error… Sorry, an error happened when accepting the invitation”. Otherwise, if I invite people who have previously created a Plex account, they never receive the invitation notice. I think there must be something wrong (or a bug) in the invitation tool. I see there are people complaining about this issue Hmm, an invite error... Sorry, an error happened when accepting the invitation''.