The data can gets lost due to several reasons but there is nothing to worry as the deleted or disappeared files can be recovered from Samsung Galaxy S9/S8/S7/S6. If you have created a backup of the lost files then you can restore them. But most of the users don't have backup and they fear of losing them permanently. In such situation, you need to use
Samsung Phone Data Recovery [androiddata-recovery.com] tool. This is a professional software that works effectively to retrieve files from Samsung Galaxy S9/S8/S7/S6. It can restore data such as contacts, photos, videos, documents, notes, WhatsApp messages and others.