In 2.79, and in 2.80/2.81/2.82 I have been able in the past to load an image as a paint brush, and then move/rotate/scale it while painting onto the surface of a model.
Now, it seems no matter what I do, the representation of the stencil image is stuck in the lower left corner of the window.
Is this a settings issue, or is there something not working properly?