if you look at the reference numbers next to the file number, you’ll see how many scenes you haven’t seen yet. Some file numbers will be the same, kind of. Like 03-KI-1-4 scene will be happening at the same time a 03-DI-6-10 scene is going on. These are just examples not actual file numbers. You’ll have to figure it out yourself but if you get the private billiard conversation with 6 and 9 then you’ll work your way through to act 2. Sorry if this doesn’t help, haven’t finished the game yet either.
I'm stuck at one file in act 2 as well. I only have three files each with 1 connection but I don't know what to do with any of them. The kitchen ones (3 talking to 11 and then storming upstairs, 8 and 10 heading to 10's room) I can't get because I can't guess (and suspect I'm not supposed to guess) the room codes. I've tried MAster bedroom, GUest room, DOrmitory, BEdroom, ENtrance, and HAll for 8 and 10; I think I have even less info as to where 3 may have gone and who they may be with.
The last file is the big 03-LI one, but I have no idea what it wants. I thought I should be trying to guess who was there before John arrived but all my guesses on that have been in vain. If it's another location after the dispersal, other than knowing its not literally just the people left behind I have no idea where they went or who may have joined them. (It wasn't just 3).