Yes, I am using the standard pop ups in the out of the box viewer.
My images are jpg�??s and are stored on a separate server as attachments to my geodatabase.
I�??m not sure what media tag is? I went into the configure window of the layer in application builder clicked on pop-up edit tab with the pencil next to it, clicked show attachments. This would give me a pop-up window with attribute data and a window with a link to the image (attached). I clicked on the link and the image would appear in my browser.
The other way I did it was by using the custom tab in the configure window and adding the image URL, that worked but the image was very small with no attribute data.
I have also attached my config file.
Thanks