From the Home dashboard and under the heading 'Operations' select 'All Jobs' 

Select your Job from the list and from the Job Details screen select 'Report Editor' from the tabs at the top of the screen.

In the 'Report Editor' select Property Photo from the left hand side of the screen and then select 'Edit' from the right hand side of the screen

Select 'Browse' to upload your photo from your desktop files and then select 'Save' on the right hand side of the screen

You can also rotate or delete your photo from here from the buttons at the bottom of the screen.