Some handy google app scripts
lock_folder.gs--can be used to collect files from google folder shared to different users. the files uploaded by different users will be segregated based on ownership and stored in folders with the user's name.
function pck_lck(nam, fld) --it is the staring point for the script.
nam :: a unique name to identify the current submissions
fld :: folder which is shared for file collection
NOTE----lock_folder.gs should be preferrably run as a time-triggered script, which triggers periodically till the end of file collection duration.