Trying to configure & use Embed

X3 page
This is a standard X3 page, using Content, which contains a bunch of HTML code, such as tables, etc., and the images are displayed using a data-popup-container.
Link to HTML page
This is a link to an external PHP file, located outside of X3. That PHP file is basically the same as the X3 page, and contains a bunch of HTML code, such as tables, and some PHP code to handle the timestamp at the bottom, and the images are displayed using data_popup, which don't actually popup, because the file is external to X3, and therefore doesn't know what a data-popup-container is.
Link to Files gallery
This is a link to an external Files gallery file, to confirm that Files is working.
Link to HTML page using Embed
This folder is currently empty, but will contain the link to the external PHP file, if/when I get Embed to work in that file.

Display Block And Map Button Exif Time Offset Incorrect