The permissible content and guidelines for these movies is at the top of the Intro Movie upload page.
If the movie is not approved, the content of it would have been in breach of one of these guidelines or the Site's Policies & Agreements in some regard.
Intro Movies are most frequently rejected because they are not purposefully recorded, it must start with you introducing yourself with your AdultWork.com Nickname.
All Intro Movies are checked within 24 hours; if your movie has not been uploaded to your profile, please try again.