The raster mask thing can be a git tricky basically you can use a mask as a raster mask from any module that occurs before it but not after it in the pipeline. So activating a module could create that. Since exposure comes very early in the pipeline a trick is to use a no op exposure module so a second instance with no exposure change but create the mask there. Now later you will be able to use this as a raster mask in any module…pipeline won’t matter as exposure is right near the start…