How do I stuff things with Polyfill without it getting so lumpy? : r/sewhelp

I need some major help with this!!! So I'm making this dress for my final project in my sewing class and I'm having major trouble with the lining. I did as the

4 Polyfill Alternatives for Sustainable Stuffing

How to Stuff a Pillow With No Lumps

Can this plush be fixed? : r/sewhelp

20-Pound Poly-Fil Stuffing For Pillow Toys bean Bag Sofa Premium Polyester Fiber 889911034058

Soft Polyester Fiber Fill, Polyfil, Stuffing for Toys, Pillows and Cushions

PLEASE ** tell me I am not the last person to figure this out! Using a piece of fabric/felt to cover the polyfill so it doesn't get caught in my stitches.

BUTUZE 150g Polyfill Stuffing Fiber Fill, White Premium Fiber Fill, High Resilience Fill Fiber, Recycled Polyester Fiber, Stuffing for Stuffed Animals, Pillow Filler : Arts, Crafts & Sewing

Fairfield The Original Poly-Fil, Premium Polyester Fiber Fill, Soft Pillow Stuffing, Stuffing for Stuffed Animals, Toys, Cloud Decorations, and More, Machine-Washable Poly-Fil Fiber Fill, 20 lbs. Box : Arts, Crafts

How can I get this cloth to fall and deform over this pile of rigid bodies? I want all the cubes to fall in the container and then the cloth on top.