How do I import an .obj in studio

I have been trying to figure out how can i import .obj files and .mtl files
but cant find the way
I tried following a few tutorials but they are too old

There is a tutorial on the Developer Wiki on how to import meshes.

i don’t have an import button
any reasons why?

If your window looks similar to this, just double click on meshes, and on the bottom, you should have the import button, you can also click the button which has an upward-facing arrow once inside the mesh folder.

image

Is there a way i can do it without publishing it ?

Create a new meshpart, and click on the opened folder icon next to the MeshId property, and from there select your .obj model