as per ur statment regardging ppls files being process. u should hv came accross the file flow pattren within LVO. once ur file reachs LVO case anlyst will go through ur file initial review if everything was complete no doubts and loopholes are in file pre-arrival will be sent with furture remarks on file to Visa Officer/CPO.
if Case anlyst find few docs r expired or needed in regard to process ur file the send ADR to the applicnt and once Adr is recived bk in the office file is being assesd on the basis of provided document which they requested which aint happening now days soo the term file processing is either only for ppl already done with BGC befr march 18 or their is no file flow for applicnts with no pre-arrivals