Looking for an app to play folders on iCloud drive as playlists

iOS & iPadOS

I have a folder with other folders inside and wonder if there is an app that can actually add the entire folder in a playlist. I am not good at explaining. Say I have a folder named Angels and this contains other folders or files. I want them all in a playlist so I can listen.
Note: I do NOT have a computer. This has to be iOs based.