How to import Apple Loops into GarageBand
I am running GarageBand 10.4.6 on my MacBook Pro (running OS 12.6). I tried to move my Apple Loops library to an external HD to save disk space and followed these instructions (https://producersociety.com/garageband-ssd-hdd-setup-tutorial/), but somehow it didn't work for me. So I dragged all the folders back to where they used to be (HD/Library/Audio?Apple Loops/Apple) and reinstalled the Sound Library. However, now some loops are greyed out and I can't use them. I have tried to find them on my computer, but to no avail. For example, 44th Street jingle (from iLife) is greyed out and nowhere to be found on my computer. I have all the missing files on an external HD, but I don't know how to import them back into GarageBand.
I wonder if someone could offer some guidance as to how to import all the missing files back into GarageBand since I do not see an import option in GarageBand.
TIA
iMac, OS X 10.11