The purpose
create a glTF (.glb) file, as recommended by Microsoft and Three.js.
How to load in Three.js is shown below.
Environment
Blender:3.4.1
Output in Paint 3D
Paint 3D, which was included by default in Windows 10 but removed from the default installation in Windows 11, allows exporting to glb files.
How to save
You can save a glb file from the top-left “Menu” -> “Save As” -> “3D Model”.
The format can be selected from glb and 3MF.

By the way
Paint 3D boasts a rich library of assets, however, the licensing (copyright) is unclear, making it advisable to avoid using them except in limited circumstances. Of course, anything you create yourself from scratch is free for your own use.
Export from Blender
Free 3D models are available, and can be exported using Blender, a leading rendering software.
How to export
save a glb file by going to “File” in the upper left corner, then “Export”, and then selecting “glTF 2.0 (.glb/.gltf)”.

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