I have made a note of this, not sure if it is of any use.
This example will convert Jamoard files to PDFs and then upload them to the users MyDrive.
Get a list of Jam files for all users. Substitute for all users as desired
gam config auto_batch_min 1 redirect csv ./JamFiles.csv multiprocess redirect stdout - multiprocess redirect stderr stdout all users print filelist fields id,name,mimetype showmimetype gjam
Download the files into subdirectories by user
gam redirect stdout ./DownloadJamFiles.txt multiprocess redirect stderr stdout csv JamFiles.csv gam user "~Owner" get drivefile "~id" format pdf targetfolder "./JamFiles/#email#" overwrite false