Guide on adding a new model, animation, and creature to HoMMV

went back to try exporting one more time... I noticed something: I imported the model with a skeleton into the editor. The model stands correctly, as it should (I rotated it forward 90 degrees along the X-axis)... then, I created a simple animation directly in this skeleton file, just for testing... I got a GR2 file... I import it into the game - in the editor, the model gets flattened, and it also rotates 90 degrees backward and clearly jitters individual elements; for example, it looks like the jaw skin is misaligned, etc.... Okay, I tried optimizing the file using Vova's GR2 TOOL_13. I insert THIS model into the editor - the model doesn't get flattened, but it also doesn't move at all... and if I open this new model with Noesis, I can see that the bones are moving...

Added 18 minutes later
I have a feeling (I might be wrong) that when exporting the model from Maya, when we remove the unnecessary checkboxes, we need to do something else, as if other checkboxes "break" the animation...