sharing iMovie data between Macs

In iMovie 10 media loaded into the app, and the projects, are located in the iMovie library.  The

iMovie library by default is loated in the Movies folder on your Mac, but in your case it appears that you moved your iMovie library to iDrive, so look for it there.   

When you locate the library, Control-click on its icon and

select Show Package contents from the pop-up menu.  A folder will appear that lists subfolders

for all of the projects and events in the library.   Clicking on one of the subfolders that bears a project name will reveal all of the original  media, render files, and analysis files.  For example, re the project My Movie:

Do not alter, move, or delete anything from the Show Package Contents or its subfolders, or you risk corrupting your iMovie library.  You can, however, copy (not move) things out of the folders. 

 The following link will connect you to a discussion on the ways to share and iMovie library for collaboration:

 Collaborating in imovie projects - Apple Community

-- Rich

Yes, that should work. Remember to copy and not move.

-- Rich