how do i add textures to an animated skeletal mesh

ive been trying to figure this out on my own for a while now but you used to be able to drag and drop a texture onto a model with no problem and it would work and show up and everything.

but after an update one day I couldn’t do it anymore before.

If I even put any textures on the mesh it just shows the 3d model greyed out and if I drag a texture onto it it just stays grey but acts like something was applied.

is there any way I can put textures on like i used to by just dragging and dropping ?

I’m convinced I clicked something by accident that made this feature go away