OBJ&FBX Export issue

Hey everyone,

I was just done making clothe mesh for my character and tried exporting it as OBJ or FBX,
then i uploaded my OBJ on mixamo to rig it as usual and then i saw that some of my mesh clothes were not there, I tried selecting them as im exporting but nothing worked so far,

my blender version is 2.92.0
thanks

Usually you can export all or seleceted only… if that’s not the problem maybe something with inverted normals and backface culling in mixamo ??

I tried export all and selected only, none of them is working, i should mention that i got the shoes from another model so i just cut the mesh and added it to my current character and then this happend.