[SOLVED] I had the same problem (June 2022). I'm using Garageband 10.4.6 under mac os Big Sur 11.6.5 (on an old macBook Pro late 2013).
When dragging a ".mp3" file (generated with Audacity), the music can be more or less recognised, but the speed is at least twice faster than the original, with kind of distorsion/saturation.
When dragging a ".aiff" or a ".wav" file (generated with Audacity), the waiting wheel does not stop turning. Garageband does not respond anymore and I have to kill the process.
Like paulowinner suggested, I put "Garageband.app" into the trash, launched "App Store...", clicked menu "Store" > "See my account", entered my apple id and password, scrolled down to find "Garageband" (oct 2014), clicked once to display the page about "Garageband", clicked the "cloud/download" button, waited a few minutes (~800Mb), opened "Garageband" (still 10.4.6) and voilà !
The problem is solved: I can now drag any file type (.mp3 .wav .aiff). They are correctly imported and played as expected.
Many thanks, paulowinner.
You saved my day !
Topic:
App & System Services
SubTopic:
Core OS
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