Tilesets Display Shadow Outlines, but No Tile Color

I imported my tileset and went to paint, but my tiles only showed up as black outlines.

I imported a free tileset from the asset store to check if I had incorrectly set up the palette or sprite slicing, but it appeared the same way. I’m new to this and I couldn’t find a previous post with this issue, so I figured I’d ask to see if I’m missing something obvious.

Asset store palette image:

My palette image:

whoops.
It’s important to make sure you use Unlit Default Sprite material when working with 2D in the URP if you want the sprite to appear as-is. This is changed in the Tilemap Renderer under

  • Heirarchy window:
    Tilemap GameObject
  • Inspector window:
    Tilemap Renderer > Material > Sprite Unlit Default