How can I search for FOLDERS containing a specific extension?
My Audiobook folder contains subfolders which themselves contain either m4b or mp3 files. In my spare time I like to convert the latter to the former but it's time-consuming and tedious and I need to keep the files in their nicely-labeled folders with reviews and other supplemental materials. I've been seeking for years how to do this but haven't yet found the trick.
MacBook Pro 15″, macOS 10.15