There is an optional "Related File" field in the built-in Image content type in CMS that is currently not exported. This is used for example for pointing to an SVG version of the image.
There is not such a "related" field in XP "media:image" content type. It could instead be exported with an XData mixin, similar to how it's done with cmsContent.
The XData mixin will be optional with a configuration switch.
There is an optional "Related File" field in the built-in Image content type in CMS that is currently not exported. This is used for example for pointing to an SVG version of the image.
There is not such a "related" field in XP "media:image" content type. It could instead be exported with an XData mixin, similar to how it's done with cmsContent. The XData mixin will be optional with a configuration switch.
(This was requested in support ticket 2539)