[3d coat not painting or not importing files in 3d coat("dx64")]

i don't know why the objects is invisible please help me by watching the video below

[model import problems]

when i import it nothing happen even with out applink. i try to import .obj and .fbx files but it dosent work. but on the right side texture tab i change the color to roughness is white object then the Texmetal is black can you healp me please?