Problems with converting .json to .ymap and moving cols

Hi there. I have a few problems.
No matter what I try, I can’t seem to move ymap’s collisions properly. The visual map itself moves just fine, but it has no collision.
I also can’t even import models into 3dsMax using Gim’s Evo to convert them to ymap. It says that it’s missing vertices.
Please tell me the best way to do these tasks. I will do my best to follow any instruction and document everything I find.
I have tried literally everything.
If you have the time and have experience, I urge you to please look at the resource and tell me what I’m doing wrong, if anything. Download resource here: link

Thank you.