In iMovie 10.1.10, unable to Share with the Mail app, but can't find the Settings to allow.

I don't think that there is any such specific setting. However, possibly resetting your preferences will solve it. Try restarting your computer and 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 projects. Now try sharing to email. Do it in a different project than last time.

Your share to email may have failed for other reasons, such as too large a file size or some corruption in the file itself.

-- Rich

Do you mean this message?

There are two preference settings that you may want to check:

• Giving applications access to data from other apps is done in the System Preferences > Security & Privacy. (since macOS 10.14 Mojave)

Open the Panel, click the lock icon, enter your password to unlock the panel. Then add iMovie to the list for "Full Disk Access".

You may also want to add iMovie to "Photos"; if you want to use videos from your Photos Library.

• For Mail to appear in the Share menu, Mail.app need to be the primary Mail reader to appear in the Share menu. This setting is in Mail > Preferences > General
• 

jlewd,

Thanks for posting back with the solution. I learned something new, as probably did

others on this forum.

Looks like léonie had the right idea.

-- Rich