Photo navigation tool is of limited use as there is minimal interaction between photo viewer and design file.
It is expected to be able to mark point in multiple photos and triangulate its location(by estimated accuracy) in file. For example to mark or digitize details that are not visible in Reality mesh like poles, wires, missing features. All necessary details ae known in exported XML so could be utilized(including distorted or undistorting photos).
As Reality mesh is always in lower resolution than input photos this is necessary. For now digitizing options on Reality meshes are very limited and not what is expected by users and real workflows.