Hi, thank you for your question. If you accidentally delete a file on your phone or tablet, don't panic. When you back up and restore your content using the storage options on your Galaxy device, you'll be able to download the file again. You can use a cloud service or a microSD card to back up pictures, videos, music, documents, and much more, so you'll never have to worry. Try these steps here to get your backed up data: https://www.samsung.com/us/support/answer/ANS00060517/
Please let me know if this helps.