You can send a video via your email campaign. Keep in mind content greater than 25 mb cannot be shared via email, because of which your video will automatically be trimmed to play the first 10 seconds and converted to a .GIF file.
Note: .GIF files do not support audio, so make sure the videos you prepare for email are usable without audio.
Best practices for sending video via email
To adhere to good email practices, your video file attached to the email is converted trimmed to 10 seconds and converted to a .GIF file. This is because emails with large files, especially MP4 files can often get flagged as spam by email services used by recipients. This is done to protect their users from potential malware.