Welcome to the forum....
You're not very clear about what you're doing.....there is no "Load" function in the software.
I assume you're Importing a shape into the workspace using either the "Import" button below the model list window...or using the Import Models item on the File dropdown menu.
If so, please note that S3D will only import .stl, .obj or .3mf file formats. .3ds format files are not supported.
Try importing the attached .stl file...its a cube.
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