LDMs
I only deal with LDMs as only handle narrow body bulk loaded and turboprops.
They should contain load after any LMCs have taken place. Generally used to let transit stations know exactly who and what is onboard and where but it's also nice to know (for our turboprops) the location and number of bags so we can plan which equipment to use and also crew configuration to start return loadsheet 2/2 3/2 2/3 etc
Although at most stations who send the LDM to me, it seems to be compiled by a different person than who sends MVT as their LDMs always have pre-LMC data so I wouldn't put much stock in their LDM actually being representative of what's onboard. I try and prepare my LDMs via a SITA programme and send once airborne.