Moving Imovie library to onedrive...?

OneDrive is a cloud service and so you cannot store an iMovie on it.

iMovie must be stored on a physical drive that is formatted Mac OS Extended (Journaled) or APFS.

-- Rich

I have no idea whether this would work but as with most things in life it is probably worth trying.

Control (right) click on the Library and select "Compress" from the contextual menu.

Once uploaded you won't be able to access it directly but you can always download it to your Mac and open it in iMovie.

You could test this quickly with a small ("Test") Library to see how well it works.

Programs like iMovie need a specific environment in order to work but the Library is just a file made of ones and zeros so it shouldn't matter where it is stored or moved.

As with everything, the only way to be sure it works is to try it out.

Practical experiment supersedes all the theory in the world. 😇

Where I said "iMovie" in my previous post, read "iMovie Library".

-- Rich