Embeds
Edit Media
Set the images of the embed
This option allows you to set the images of the embed. When clicking the option, a form will be opened where you can fill in the following:
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Image URL -> Image at the bottom of the embed (Green box)
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Thumbnail URL -> Image in the upper right corner next to the text (Pink Box)

Edit Media Form
Once you submit the information, the embed is updated.

Updated Embed
Keywords: edit media, image URL, thumbnail URL