Apparantly there is a bug (from googling the problem, others have experienced it) using Adobe products with Mac Monterey. When I finish editing a photo in Photoshop and want to save the PSD (or Tiff, or JPG) on my internal boot drive, "Save as" is greyed out and not an option. Curiously, I am able to "Save as" to any of my external drives. Has anybody else experienced this and figured out a work around?