In order to recover deleted files from Android, follow these steps
The first thing you need to do is download a powerful data recovery tool for Android OS, such as Tenorshare, Dr.Fone, etc.
After installing the data recovery tool for android OS, connect your Android phone with a USB cable to the computer and launch the program.
Then click "Data Recovery" from its main interface.
Then choose "Recover Data from SD Card," then you will see all available drives of the sd card in the pop-up window; please make sure there is no external memory connected to your device except the SD card.
Now you should check up "Android Phone."
If your mobile phones are shown now, it means that they have been recognized by this software,
Now select those files which were lost or deleted accidentally from them and hit the Recover button at last.
It only needs a few moments when these things would be finished perfectly well.