@benbag13 Sorry to hear you’re having issues. For whatever is worth MP3 files can’t be exported, only MP4’s.
For the camera issue, please try the latest development version here: http://pencil2d.org/download#nightlybuild
Also try to export a movie with the AVI format, those are a bit more large but generally supported by most computers as the MP4 encoding (how it processes the final video) might not be compatible with your hardware. It’s rare but it can happen.
If none of these recommendations work for you, we’ll try other troubleshooting steps, but if that fails as well, I might have to recommend you a different application to at least help you out to continue your work without further issues.