Restore backup wallet
you have in the wallet on the right top the 3 points. click on it. click on "security" (or something like that, on my phone the language is not english). in my case i have several options including "save wallet" and "restore wallet" (or something like that). when you click the restore-option you should be able to choose your backup if the app finds your backup (in my case it finds my test-backup in the downloadfolder on the sd-card for example).