Many UpStream users want to add media to their projects.
For adding images, there is an “Add Media” button next to all the WYSIWYG areas, so you can use the WordPress Media library.
For videos and other embeds, the WordPress code has limited support for embeds outside the post editing screen. So for embeds in UpStream, we recommend the the EmbedPress plugin. This plugin works in a different way, so doesn’t have the same limitations as the WordPress core embed feature.
If you install and activate EmbedPress, you’ll be able use embeds inside any WYSIWYG area in UpStream. Just add the URL into the body. This image shows a YouTube video embed in an UpStream task: