How can I import my models

I've been trying to use this software in Steam Play, Proton, Wine, what have you. My OS is Manjaro Linux and I use Proton-5.11-GE-3-MF. When I first install the program, it runs fine, but the next time I open it, it doesn't appear to open, even though Steam says it's "Running." If there is any way I can debug this and see if there are any errors or anything, please let me know, thanks!...

如題TT

could someone help me convert an MMD avatar? there is only one video on Youtube, but it wanders too much and I do not understand anything.

How do I config the rigging in Unity for a four legged / animal model ? I Know how to config for humanoid, but I would like a four legged tto work without the arms going funky. I guess a could configure them as legs too, but then I got error message because it lack arms bones rigged...