Hi fellow BitD-ers! I am currently learning the system and started a solo campaign (don’t judge me on that lol), two sessions in I finally have a reasonably good understanding of how different mechanics work. However, I did not manage to find some clear information about how flashbacks are supposed to work:

• How far or close in time can a player flashback to? IIUC, the whole mechanics is supposed to replace the tedious prep phase and taking some decisions before the actual mission. Can it be a flashback to a point in time before even knowing what the mission would be (“Several years ago I hid some tools in this prison, just in case”)? Could it be to a moment during the mission (“In fact, I set some papers on fire before leaving the previous room so it should cause some panic and confusion among guards”). I did this last one on my first session and, given the fact that I am my own GM and my only player, I was pretty happy about that. However, I do not know how canon it is to the RAW.
• If I understand correctly, a flashback should always cost 1 stress. Hmmm, should it? I read every now and then that people only apply stress in some cases (bad flashback roll, very difficult task, etc.). I cannot find anything in RAW about it, are people just massively homebrewing that?
• I also see a lot of GMs saying that flashbacks should never fail and a bad roll should result in a complication (heat, stress, bad position) but not in a missed opportunity for a good player’s idea. Once again, I cannot wrap my head around that in RAW, it seems to me that a flashback just calls for a roll and is interpreted as any other action.

Thanks in advance to anyone who has some details on that and may y’all retire with a fine stash!