I have used the Adobe capture app to create a brush that I want to use on Adobe sketch. The image I uploaded was black. After I saved the brush I went to use it in the sketch app and was able to pull it up. When I selected a different color let's say yellow and I go to use the custom brush it paints the strokes as black and yellow instead of just yellow. Is there a way to fix this issue. Thank you.
Go into your brush presets (Edit - Presets) and make it a B&W brush instead of an RGB brush. The drawback is B&W brushes treat the color as opacity as well; only pure black is purely opaque, shades of gray are also shades of transparent.
Let me know if that works for you.