I still dont know what im doing wrong, I tried to make model smaller or split it in a half, but same square collision, is there a chance that this is happening cuz I didnt configure everything properly in blender?

$staticprop
$modelname "afghanistanmodels/testmodel"
$scale "4.000000"
$body "Body" "testmodel"
$cdmaterials "models/afghanistanmodels/"
$sequence idle "testmodel"
$surfaceprop "concrete"
$collisionmodel "collision" {
$automass
$concave
}

I have concave but it's not helping(

so i made a big building (just parking building) and after i was done with everything like textures, model etc. new problem arrived, i just copied the model of builing to make a collision basicly its just lots of squares.
after i added it in a game it had just big cube collision and i weren't able to go inside building.
how can i fix this?

https://imgur.com/0pC3o2H
https://imgur.com/a/spXkfLq