It is currently not possible to embed images in Canvas ePortfolios via the Insert/Edit Image feature in the Rich Text Editor.

Instructure is working on a fix for this issue. In the meantime, we recommend using the “Image/File Upload” function found in the “Add Content” area on the upper right side of the page as a workaround to this issue. This will allow you to add embed images between “Rich Content” text block areas as needed.

For more information on adding images to ePortfolios, please see:
https://community.canvaslms.com/docs/DOC-10499-4212717372