JS Transporter feed does not have File libraries qualified to work with the File System of the Archer directly. You can use Post Processing options to some degree, but I doubt this is your case.
Thus, you need to use some API to store data to. Like SharePoint API my have endpoint for storing the data upon receiving.
Sure, will do. I really wish that Archer had a straight forward solution to this. Developing an Integration just to move files to share point just consumes a lot of effort from both sides and a lot of organizations don't agree to spend time and effort for this.