Start by going to Workspace > Email Marketing > Templates. Once you have your template picked out, click on Blocks or Content on the right-hand side and search for Video (see image below.) Now click and drag the video icon to place it into your email. After this, double-click on the video image and insert your video's URL. Your video will then appear in the email template.
If your YouTube video does not have a thumbnail image or you would like to change the image shown, follow these steps in your YouTube account:
1. Sign in to YouTube Studio.
2. From the left menu, select Content.
3. Click the video you'd like to edit.
4. Select an auto-generated thumbnail or click Upload thumbnail to create a custom video thumbnail from an image on your device.
5. Click SAVE.
Once your new thumbnail is created, follow the steps above again to re-upload your link to include your new thumbnail image.
For all other video sharing services, like Vimeo and Dailymotion, you will use a static image with a link to the URL. This will require you to create a static image of your video. You can take a screenshot of your video and save it as an image.
Once the image placeholder is inserted where you would like it, click on the image placeholder and paste the URL for the video in the Link URL box. When the recipient clicks on the image, the link with open in a new browser window so they can view the video.