I'm an idiot and was not paying attention when something came up to be synchronized yesterday (Excuses: I was in middle of moving my office, movers were asking questions, I was on the phone to my wife as I clicked the accept button, sun was in my eyes, etc.).
After whatever it was downloaded, my phone says my memory is critically low and I should use File Manager to delete or move files. Problem is, I don't know what I downloaded, so I don't know what files to delete/move. I think it was related to Windows Media Player, but I am not sure. I have looked for "extra" files, but cannot see anything. I have no idea what to do now.