Under the Files tab, tap Recycle Bin. Choose the files that you wish to restore, and tap the restore icon in the upper right-hand corner.

1) Under the Files tab, tap Recycle Bin at the bottom of the screen.

2) Long press the file you wish to restore, and tap the restore icon in the top right-hand corner of the screen.

TIP: You can tap other files to restore them, as well.

Outcome

You have restored the files in OneDrive for Business.