I had the same problem, until I opened the dropbox app and... voilà! solved! Try to open the dropbox app and give it time to update the libraries

Hi all, So I'm having exact same problem with zhivago, which I can't open a file that I shared through dropbox (and later airdropped) from iMac to Macbook Pro. I tried to take the steps that zhivago said about sharing through mail but I simply can't open file on GB. Can anybody help me out with any possible tips? Thanks, Inkeun

Hi Inkeun - If Zhivago's approach isn't working for you, maybe you can try one of the other suggestions in the thread.. - Manually zip the GarageBand .band file [ found in your home folder ~/Music/GarageBand ] and upload that to DropBox [DropBox sometimes has issues with un-zipped files] - One poster said it worked for him only when he used the DropBox application [as opposed to using DropBox in the web browser] -- I never use the application myself but it might be worth a try - Try with a different service [ Google Drive, WeTransfer ] to see if the issue is specific to DropBox