With everything else checked, deleted, and adjusted, you can safely save your file with the model in the screen orientation you want for its thumbnail. Before you upload it, a good test for correct behavior is in order.

In a new SketchUp file, import your model and check the following:

• Does the thumbnail look correct?
• If designed to interact with existing geometry, is it attaching to other faces as intended?
• If it is a free standing model or component, does it insert at the desired point?
• Select the imported model or component. Is the bounding box tight to the geometry?
• Can you use the Move tool to interact with the component?
• Can you apply Materials?
• Can you edit the component easily?

Once you’ve answered these questions you can upload your model!