If you make it small enough to email, you will have to seriously reduce the quality. That isn't really desirable in a video you paid for. If you want I can set you up a place to put it so they can download it. I might even be convinced not to look at it, but you would only have my word on that.
Alternately, you could put it in your google drive. You can download drive free on your phone. Then upload it to drive, and then share it from google drive. That is probably the technically easiest and most secure way to share it.
Upload it:
https://support.google.com/drive/ans...DAndroid&hl=en
Share it:
https://support.google.com/drive/ans...atform=Android