Is there a way to include a hyperlink from the text in one of the draw.io objects? This would help to link from the diagram to relevant Confluence pages.
Select the cell, then from the menu use Edit->Edit Link, insert the URL, click OK.
A new right click menu option will appear "Open link" that then takes you to that URL.
Another option, choose the macro 'iFrame' and then paste the link. You should also change the width to 100% and the height as well. I usually use anything up to 1024.