Any tutorials on Tiled Input?

I’m stuck using the Tiled Input node.

Step 1) I export my tileset from Photoshop as either JPG or PNG (I’ve tried both). They’re named "filename-“x”_“y”.
Step 2) I open a “Tiled File Input” node and specify my tileset, which gets validated. But nothing shows up. I just get a red error square on the node.

Am I missing something? Is there a simple tutorial or documentation to describe this node at all? I feel like I’ve looked everywhere but there’s no information that I can find.

I’m using pro version if that helps?