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Logic Pro project files cannot be opened after moving to OneDrive

I uploaded all my Logic Pro project files to OneDrive because my Macbook M4 was running out of space and I was already paying for Microsoft. I downloaded a project from the cloud to work on it, when a pop up message appeared saying:

"The document “___.logicx” could not be opened. The file isn’t in the correct format. The file might be corrupted, truncated, or in an unexpected format."

It said the same for every single project file I uploaded to the cloud. I asked Google Gemini how I can try and fix the problem and have tried methods like Compressing and Uncompressing, Manually Reassigning Logic Pro as the preferred application, and Forcing Logic Pro to Open the Package from inside the application. Another suggestion was to rebuild the package by selecting "Show package content" and dragging the media/audio files into a new Logic Project, the only problem is that the audio is raw without any of my edits, presets, or automations still in tact. Also, it only shows the audios, not MIDI, and most of my songs were created with MIDI.

I have no idea what else I can try, and I genuinely hope that 6 years worth of demos aren't lost forever.

2 replies

External drives formatted for the Mac are the best place and way to store files that you don't want cluttering up the Mac's startup drive, including your Logic projects.


Most any external drive brand will work as long as you first erase and format it for the Mac.


In your case, you might simply copy your project files back to an external drive, and with luck they will not have permanently lost their attributes. If after that you find the integrity is in fact compromised, then you might recover your projects from your backup drive. You do backup your projects, yes?


If not, then: Back up your Mac with Time Machine - Apple Support


I recommend not to open a logic project or work directly from any cloud service. I only store zipped projects in the cloud. The same applies to FAT-formatted disks.