The first thing I wanted to do was highlight a non-rectangular area, as if with one of those colored highlighter pens
The edit screen even says "TIP: Use blend mode "Multiple" to let background image shine through"
But there's no "Multiple" on the blend menu, the most similar would be "Mul" (Multiply?)
I tried almost every blend mode and saw no difference in effect at all. Red pen, acts like a real paintbrush and obliterates the background. What am I missing?