Lost Audi recording

[Sam Hunt 77]

I recorded voice recording on my mobile then moved it to Secret Box App, It didn't play so I did "restore" but I can't find it anywhere, the problem that I thought secret Box app has problem cause it stopped playing the videos and voice recording I kept in it so I deleted the App, where should the restored file went? where can I find it and how? I've checked all files in "My /file"