File No Longer Shared

I’m in school online so I’m constantly downloading articles from the school databases and highlighting them as I read them so I’m not killing a zillion trees. I just came on and the tab I had open said the file is no longer being shared and when I look it’s got a red x next to it on the list of things I’ve worked on. I think most of the time I am not even uploading them to Kami, is that the problem? I’m using the Chrome Addon when I’m on the doc and then it opens a new tab with it in Kami. Maybe if I DID save them to Kami, this wouldn’t happen? I’m not sure. I’m wondering if because it’s from paid databases that’s why they’re disappearing.