I have followed many tutorials but cannot get materials to merge properly.

Using plugins and blender I have merged the textures, however then it does not have any of the bones, which is another problem. Leaving me in a position where I can only have the textures or the bones/physics.

Is there any way to merge materials in unity itself? Am I somehow exporting it wrong and deleting the bones?

Additional info: The avatar I'm using was made in Vroid, as such it was originally a vrm but was converted to be compatible through other plugins within unity.