embed-from_ext_site
This is an image linked to another external Omeka website:
https://smartcat.harlemline.com/files/fullsize/d5258eebe65360f1703217594859b511.jpg
ext image (this results in a popup in browser)
<iframe src="https://collections.chattlibrary.org/files/original/27641/00011267_d.jpg" frameborder="0" width="100%" height="800"></iframe>