Garage Band is recognizing ".aif" format loops but not ".aiff" format loops

Question

All of the ".aif"-formatted loops (from Jam Packs, etc.) are showing up fine in the Loop Browser, but other loops I bought from third-party vendors that are in the ".aiff" format are not showing up at all in the loop browser. They are all in the same correct folder for loops on my system along with the working Jam Pack loops. I tried dragging and dropping a bunch of these loops onto the blank space on an open session based on some advice I read on the internet, and Garage Band processed them (and created new instrument tracks on the screen for each loop) but they did not subsequently show up in the loop browser as I had hoped. Do I need to reformat these to ".aif" somehow? Any help with this would be greatly appreciated.
Thanks.

Answer 1

Just to follow up, draggging the loop folders into the loop browser didn't work exactly on its own, but I got it to work in the following manner. First I went to the finder and deleted the apple loop indexes in each of the two locations where apple loops are stored in my computer (note to Apple: why multiple different folders for Apple Loops?). Then I dragged all of the Apple Loops that were stored in the second loops folder (in the Library under "Audio") to the first Apple Loops folder. Then I dragged both entire Apple Loops folders (required even though the second one was now empty) into the loop browser. Upon dragging the second one in, Garage Band automatically began reindexing my loops and then everything showed up in the loop browser correctly, finally. Apparently both (or all) locations where Garage Band stores loops must be individually dragged into the loop browser to trigger the reindexing process. This process was harder than it should be and I feel like it represents an annoying bug in Garage Band, in addition to the help from this post I also had to google research the problem for quite some time to figure out this process.