To recover deleted files such as document files, photos, videos and audio files from USB flash drive you can follow the below solutions:
From Backup - If you have kept the backup of your files such as on your computer or on any other media storage device then you can restore your deleted USB data from there.
By using Data Recovery software – You can also go for specific data recovery software like Card Data Recovery tool. Read this - How to recover deleted files from USB flash drive? From here you can download the specific tool to restore your deleted files from USB flash drive.
Hope this may help you.
