What should I do if I could not upload the videos to YouTube or FaceBook?

If you failed to upload the videos to YouTube or Facebook all of a sudden, it might be caused by the change of the website, network connection or other unknown factors. You can make a screenshot (Press Command+shift+4 at the meanwhile) of any error message and send it to the technical support for analysis.

Then you can export the project file to a MP4 video first, and then go to YouTube or Facebook webpage to upload the MP4 video from the local hard drive manually.