I am using Adobe Photoshop CS6 and this is the first time I am using a program of this complexity for pictures. I opened 12 photos and turned them into a 360 degree panorama of Yosemite. At the very least, I would like to fill the sky, as I would think that would be easy for the computer, and then simply crop off the bottom if it does not work. The problem I am having is I click "w" to select the grey and white checkered area with the magic wand, then click "m" to move to the marquee tool, then right click the selected area, scroll down to "fill," make sure that opacity is 100% and blending mode is "normal" and contents use is "content-aware." NOTHING happens. Ever. I even tried selecting the contents use to a simple "color" fill and still nothing happened. Please help. I have been searching and watching so many videos and trying everything I can think of but everyone always just suggests putting opacity at 100% and blending mode to "normal," which I have.