Hi,
I tried both placing markers and shapes on the cloud in the Model view, as well as placing markers (Add Marker) and shapes in the Photo view. The marker appears in the reference pane, but with no estimated position.
There are 50 aligned cameras within the same region as the imported point cloud. I've also (semi-) successfully performed dense reconstructions with the aligned images, so there's nothing wrong with the alignment.
The result is not pretty though, as these images are from 1910, so that's why I'm attempting to project features onto a modern DEM instead.