My materials with a cropped-out background do not show up as a clear background, the background is black and not invisible. what error did I make when doing this?
Hi @Jacob_Mcbride,
Can you share more details of your exact setup? Even better share a sample scene.
ok.
This white area (as shown below) does not show up on the box
This is the asset. the tree does not show up without a background.
Or at all for that matter.

Is the texture a PNG? Does it have a transparency/alpha channel?
Is this an element or model/render component?
If it’s an element component you need to provide a PNG with an alpha channel for the transparent part of the image (=white background) not to render.
If it’s a model/render component, you need to set the image in the Opacity channel, enable blending e.g. set it to Alpha and select the right channel in the settings (if it’s a PNG set it to A which means alpha). Example setup for material:
I am not sure.
here
https://launch.playcanvas.com/1330269?debug=true
i will give you the editor link through the game chat.