What are the steps to display my .cube with a background image rather than a black background color?

edit

Open your 3D modeling software and open the project file containing the .cube object.

Choose a background image that you want to use. It can be any image file that is compatible with your software.

Import the background image into the 3D modeling software. The import method will vary depending on the software, but it should be accessible from the menu or toolbar.

Select the .cube object in your project and open its material editor.

In the material editor, find the option for background color or environment map.

Choose the option to use an environment map and select the background image file you imported earlier.

Adjust the settings for the environment map as necessary. This may include adjusting the brightness or reflection levels to match the lighting in your scene.

Preview the changes by rendering a test scene or using the software's built-in preview feature.

Save your project and export the file as needed.