"Sorry, unable to map your existing skeleton"

[Серафим361646245x2l]

when I put .obj, .mtl and texture files in a .zip archive and upload this file to Mixamo, the error "Sorry, unable to map your existing skeleton" appears. I have attached these files below (I also tried using fbx format, it did not help). This 3d-model is generated by a neural network, if that matters.

[Ussnorway]

if you share the model i'll test it

[Серафим361646245x2l]

Sorry, I thought I attached the model file

[Серафим361646245x2l]

When I attach a .obj file to a post the file is deleted.

"Correct the highlighted errors and try again. The attachment's 7f98d219f717_boy_in_cartoon_styl.obj content type (application/octet-stream) does not match its file extension and has been removed."