I would suggest dividing it into shorter movies. You can do this by selecting your Project in the Project Library and clicking FILE/DUPLICATE PROJECT. Do this 3 times. Keep one copy as is. Name the other copies part 1, part 2, part 3, etc. Then edit part 1 and delete everything but the first hour. See if it will share to Media Browser. If not you may need to shorten it some more.
Lather rinse and repeat.