Hello @ElenaM20 ,
Due to sizing restrictions for sending emails in general, embedding / attaching videos in emails sent through us simply won't be possible without major changes to the infrastructure of email as a whole. You won't be able to include the full video, nor a preview. Linking to your Insta video is just that, nothing else.
The closest to a "preview" would be the image-linking method, where you can at least use a thumbnail as the image. This would require you upload the image to your account, insert it into your email, then link to the video via that image.
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