How to embed folder.jpg to each mp3 file?

I have my entire music library organized into separate artist folders then seperate subfolders for each album. Within each folder I have a folder.jgp file along with the corresponding MP3 files. Most of these files (97%) are already tagged in some fashion... very few are not tagged.

I read somewhere that MP3Tag is capable of going through and finding the folder.jpg files and automatically embedding it into every MP3 within the folder.

Is this correct? If so, what are the steps to accomplish this task. Thanks

Yes, this is possible using the action Import cover from file.