I still can't seem to save settings when I set up the Big Blue Button activity for the rest of the weeks. I also had the same problem with saving a forum activity. You can see that in the video.
I watched your video. I disabled the upload of MP4 or MP3 files because they slowdown the site. Can you just paste the links of what you're trying to save? You can only share links. I suggest you do what I do, you upload the MP4 or MP3 to Google drive, share it as public or viewable by anyone who has the link. Go into Generico and paste it.
Here's how to share MP3 or MP4 files as links using Google drive:
Yes, my first thought was that there is some restriction but even when I used Generico and pasted the link from my screenpal it still didn't save. Instead of the drive I used screenpal as the video was short.
I just tried it again but this time changed the ratings setting ,which I hadn't previously though there was whole forum garading, and this time it worked. Could that have been the cause ?