Why can’t I play video or audio items in my multimedia galleries?
When you test your generated web pages by viewing them on your local computer, you may not be able to play the video or audio files in your multimedia galleries. Your browser shows a question mark where the video or audio should display. Other types of multimedia files might be affected as well.
This behavior is by design. Due to security concerns, many Internet browsers restrict access to local files on your computer. The browser will not play certain files to avoid running any malicious programs, even though the files are your own video and audio files.
Once you transfer your pages to your website at your Internet Service Provider (ISP), and view them over the Internet, you should be able to play your video and audio multimedia items.