Startup movies are not being copied to the Content/Movies directory within the Content Browser. This can be confusing to users as it is not editable, but still functions correctly as a startup movie.
I believe the source of this issue is a missing dialog window that notifies users "a change to a source content file has been detected, Would you like to import it?" This does not appear in the 4.13.1 engine version. I have attached images for clarification.
1. Download the attached movie file.
2. Create new blank project without Starter Content.
3. Navigate to Project Settings/Movies/ and press the [Image Removed] symbol to add a new movie.
4. Choose the downloaded movie file.
Outcome A prompt appears to copy the movie file, but the movie is not copied to the Content/Movies directory in the Content Browser. It does exist in the Unreal Projects directory though.
Expected You should be prompted to copy the movie file to your project via a dialog window, and after selecting 'Yes' you are able to see the movie in your Content/Movies directory within your Content Browser as well as your Unreal Projects directory.
Note I noticed this issue does not actually affect playback of the Startup movies when run in Standalone.
Head over to the existingAnswerHub thread and let us know what's up.