I have an HP ENVY x360 laptop, which has a fully compatible touchscreen. It can be considered a 2-in-1 laptop/tablet hybrid. I installed Photoshop, and other tablet applications that I've used in the past seem to work just fine. However, when I try to draw onto the artboard in Photoshop using my laptop's touchscreen, the brush tool doesn't appear, even though it was working just fine with the mouse. I have no idea why that is. Please help!