If you have an iMovie project open in iMovie, you can change the file format to YouTube supported versions from the File > Convert menu. If you’re having trouble uploading your movie, make sure that it is in the correct YouTube supported file format. Log in to your Google account if prompted and follow the instructions to complete the upload. You will need a Google account to upload the movie to YouTube. To upload a movie to YouTube, open iMovie and go to File > Share > Send Movie to YouTube. Yes, it is possible to upload an iMovie to YouTube. In this case, try reinstalling iMovie and also make sure your YouTube account is in good standing. If none of these steps solves the issue, it’s possible that there’s a technical issue with either YouTube or iMovie. If it’s not, select the Sign In link and log in with the correct Apple ID.

Make sure the correct Apple ID is listed at the bottom of the window. To check, open iMovie and select Preferences. If you can’t find your YouTube account in iMovie, make sure you’re signed in to the same Apple ID you associated with it.

Make sure the option to “Make my videos public” is enabled. To check, open YouTube in a web browser and select your profile icon. Also, make sure you have enabled sharing options for the account. If you’re logged in to the wrong account, try logging out and logging in to the correct one. How to Upload iMovie to YouTube on Your Mac in 10 Simple Steps (iFilmThings)

Imovie to youtube