If you are using the Skylight Mobile App to send a video, there is no size limit.
If you are sending videos to Skylight via email, the largest file size accepted is 25MB in one email. If your file is too large, you may receive this message: "552 5.3.4 Message is too long."
This feature is only available with Frame Plus subscription. If you wish to upgrade to Skylight Plus, please see https://www.myskylight.com/products/skylight-plus/