If you’ve deleted files from your computer, USB drive, or phone, they are quite likely still in your system. You still have options.
First, check your recycle bin.
If you don’t find it there, there are free file recovery programs.
This popular choice works on most Windows systems: http://www.ccleaner.com/recuva
Click the Scan button, and it will list any deleted data that can still be recognized as files. If the file is recoverable, you’ll be able to select it. Then just click the Recover button.
For Mac recovery, try: https://www.cleverfiles.com/
It lets you preview files before recovery, perform partition recovery, or back up an entire drive.
It also works with Windows 7 and up.