Here are the possible ways of referencing to images:
Image reference examples Images stored in same folder as xml file
images stored in a sub folder inside the same folder as xml file
Images stored anywhere and referenced by accessing the full path name. This is referred to as an absolute path name In the Documents folder on your PC:
In the Documents folder on your Mac:
Where username is to be replaced with your username (in my case that would be “carijansen”) and RestOfPath points to sub and sub-sub-folders inside the Documents folder Images stored on another volume (server) from a Macintosh OS:
Where VolumeName reflects the volume.
Where ServerName reflects the name of the Server you’re connected to.
Ultimately, the file has to be residing on a network volume and not on a web server. So the path has to be Absolute path to the network volume and not a URL, because ID will not dynamically make calls to URL while opening the file or importing the XML.