If you have an online video you want to show during a synchronous session, the best way to do that is by using the Share an external video link option. Click the blue plus button in the bottom left corner of the presentation screen and choose Share external video.
If your video is not online, we recommend that you contact email@example.com to discuss your options. Screensharing to show videos has not been working well.
Click here for more information about sharing videos.