Uploading Blender exported 3D model file to Mixamo with textures

Hi,
I am an amateur game developer. Recently, I have bought some assets for my game and the model file is an fbx file. I can export my characters from Blender but I am unable to upload them to Mixamo with textures. I tried to upload it as an fbx file. I also chose the "path copy" and "embed textures" options when I exported the fbx file from Blender. However, characters appear without any texture. 

I have attached the fbx file.

I would appreciate it a lot if you could help me fix my texture problem.

Many thanks,
Nil