I’m on iPhone and I recently checked my files and I saw I had around 4 files downloaded. I never download anything on my iPhone that’s not from the AppStore, and my phone isn’t jail broken. The files where in a folder called Aeries portal which is an app that I use for school for grades. I can’t remember the file names but one ended in .realm and one in .management. Some of the files didn’t take up any storage at all and some barely even did. I previewed to see what was in the file and there wasn’t anything. They were pretty much blank files. They where also downloaded around a year ago and I haven’t seen anything suspicious before. I deleted those files and they haven’t returned.