skp to ply conversion is used for the purpose of exporting 3D models or other content made using SketchUp (.skp) to a polygon mesh format format (.ply). This function is not supported by default in SketchUp, but you can find various importers and add-ons for the tool that add support both import and export of PLY format.
Except for that, your only remaining options is to either use an exchange format supported in SketchUp to transfer the content to another software that allows export to PLY format. Or find a dedicated converter that will be up for this task.
Updated: November 2, 2023