File becomes corrupted after inserting a .mov file

I have created a learning module using Articulate Storyline 3.  Everything works fine until I add a .mov file.  It will save but then when I try to reopen the file it indicates "either this file was created using an earlier version of Articulate or the file is corrupt."  I used Storyline 3 to create and open the file so it must be a corrupted file.  I have recreated the module a second time and the same thing happens.  Please advise