Screen shots work well if the size of the image is relatively small. You should be able to attach those to emails (or post them here -- see the "Image" button to the left of the editor where you create your posts).
I've never had anyone send me videos as attachments to show problems before. If you want to use videos, I would suggest posting them to YouTube and sending a link. In most cases, however, screen shots serve to demonstrate the problem.
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