PDF AutoSave saves the copy of the  Autodesk® Inventor®  drawing automatically to PDF during Save command. The file is saved in the same folder as the original drawing with the same file name.

See detailed information here: https://meksystems.fi/wp/autodesk-apps/pdf-autosave/

Note! PDF AutoSave works only when drawing is saved after modification. So it does not make a PDF if drawing has not changed.