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Native worked fine in Garageband under Sierra but since the update wont load. Apple decided to change its sandboxing requirements for GarageBand in the Golden Master release of High Sierra; that is, we (and many others in this industry) had no warning of this change until right before High Sierra. MacOS Sierra review: Mixing iOS with OS X to make a better Mac. 8 hidden features of macOS The new Optimized Storage feature in macOS Sierra is designed to help free up precious storage space This is an interface you can use to sift through your files and figure out which ones to delete or move.