Please check the DevHub for information. StudioService is here.
StudioService provides access to configuration of Roblox Studio, allows importing files from the user’s file system, and other miscellaneous information. It is intended to be used by Plugin s in order to provide a consistent user experience.
StudioService is mainly used for altering very select uses in studio using a plugin. A common use, at least for me would be PromptImportFIle() and PromptImportFiles() method that allows the user to promptly import files to the game, naturally. It has some use cases but it’s meant mainly to change some studio elements. These are methods however that you as a developer may not find much practical use for any workflow you might be thinking of.