You can hide them as below, however this is only for files you have added yourself. Any folders tied to an application such as Whatsapp etc will refresh the data and show them again:
To prevent non-music files from appearing in the music player, you need to create an empty file called “.nomedia” or “.nomusic” and place it in the folder containing the unwanted audio files.
To create and save an empty file
Use a text editor application on your computer, e.g. Notepad. Make sure to set Save as type to All files instead of Text document. Name the file “.nomedia” or “.nomusic”.
Connect the phone to the computer using a USB cable. Copy the empty file to the folder or folders that contains the unwanted audio files. Disconnect the phone and restart it.
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