Almost every PDF reader will spin a page on screen, and almost none of them save it. Close the file, open it again, and the scan is on its side exactly as before. This rotates the pages in the document itself, so the file you send is the file they see.
Free on every plan, including the free account.
The Studio holds more than twenty-five tools. Rotate Pages is the one that changes the document rather than the view.
90° clockwise fixes the usual sideways scan. 180° is for a page fed in upside down. The turn applies to every page in the file, which is what a whole scan fed in the wrong way round needs.
The new PDF is built in the tab you are looking at and downloads straight to your device. Nothing was uploaded, so there is nothing left behind to delete.