Update created new catalogs but if forgot to plug in my external hard drive!!!

i just did the most recent Lightroom classic update and it asked me to update my catalogs, which I did. However, I forgot to plug in my external hard drive before doing so. It updated the few folders I have on my computer hard drivejist fine, but now when I plug in my external hard drive it didn't seem to update these folders and I can't find them anywhere through Lightroom classic. The folders still exist on the external hard drive as before, but Lightroom won't recognize them.