In the Harmony download version 0.21.4 I have the modify image radio button, but it does not show the scrollable list below. That area is just blank.
In the online Harmony version 0.26.0, I do see the scrollable list and can pick a picture, but it times out in the proceed operation.
I will try the 2.06.4 version. 2.05 is giving me intermittent PLM not available messages, but seems to work if you ignore them.