problem IMOVIE wont let me Save Video

iMovie 10 automatically saves projects as you are editing. You don't need to do anything. You can close out of the project and reopen it from the Projects browser screen and take up where you left off.

To email a project, do File/Share/Email when the project is open. A blank email will open and the project will share into it. If the movie is too large, your email provider may reject it as exceeding the size limits of the email program. In that case go to System Preferences/iCloud and sign in to iCloud and check the Email box. That will give you an iCloud mail account that will let you send emails with larger files.

-- Rich

Follow this file path to the iCloud preference: Apple Logo/System Preferences/iCloud. You will see this:

After signing in to iCloud, check the box for mail. Then share to the iCloud mail account.

If iMovie is shutting down when you try to share to Mail try opening iMovie while holding down the Option and Command keys and selecting to delete preferences in the box that appears. iMovie will open in a new library. Reopen your old library to get back to your project. Now see if your project shares out to Mail.

-- Rich

Try shutting down and booting up in Safe Mode (see Help for instructions). After everything loads, immediately shut down and reboot in normal mode. Now see if you can share out.

If still no luck, update to current iMovie 10.1.10 and Mojave and see if you can get things working.

Rich

Open iMovie and click on Help in the menu bar at the top of your screen. Type in Safe Mode. You will be shutting down your computer and booting up in Safe Mode. Then follow my directions in my previos post.

-- Rich