Whenever you download a file using your mobile device, depending on the file type and also your designated download location on that device, files may be saved to your “My Files,” “FILES” or “FILE MANAGER” folder. For photos and videos, once you locate them in your files folder, you should be able to move them to your gallery.
Android (Samsung) image
iPhone image
Having trouble watching after downloading videos? Visit this article: https://support.filemail.com/en/articles/1233821-watching-a-video-on-your-phone