It took me a long time to figure this out, especially since I didn't know anyone that could, nor would, help me. I often found that many people that use Adobe After Effects don't use it for the things I wanted to. Eventually I got help from Adobe. I used Textured Quad-polygons to get my particles to work.
I made several layers, and used track-matts, alpha channels, and masking. My computer crashed several times due to the heatwaves in the summer trying to make this work.
Final Version
BlackUniGryphon Logo n Leaf Particles 001 (No scaling)
Leaves Particles Adobe After Effects CC 2018
BlackUniGryphon Falling Particles 002
BlackUniGryphon Logo Particles 003
BlackUniGryphon Logo Confetti Particles