Google Drive can be used to add images to your Workspace Description. Many other picture sources will not work.
From your browser:
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Upload the image to Google Drive (+New > File Upload)
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Right-click the image in your Google Drive and select “Get link”
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Change permissions from “Restricted” to “Anyone with the link”
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Copy only the file ID: the part of the part of the URL between
/d/
and/view?usp=sharing
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Insert the file ID into the following markdown in the Workspace description:
![<alt description>](https://drive.google.com/uc?id=<File ID>)