Worlds disappeared (Android, Galaxy s9)

I created a world last night and worked on it for hours with another player. I named it "mission survivalist". I left the minecraft app for a second then I got back on and it was telling me to log back on. At the time I didn't see a problem with it so I go to log back on but it then sort of fixed itself and I went to check on my world and it was gone. I changed the storage file too and it didn't work.