I'm catching up so my apologies if this was already answered but I was part of that original discussion and the very reason it interested me is that those time stamps on Snapchat would be of the time it was uploaded, not when it was taken. You can even take the picture with another app, or I could say, take a photo I from months ago, upload it to Snapchat, and the time on it would be the time it was uploaded, not the time it was taken.
I'm not sure it's ever been confirmed reception was an issue (but of course that also varies by provider. I know I've used Sprint, AT&T, Verizon, and a couple of prepaid options that are run over one of the above three companies networks and Sprint especially but also AT&T have issues in rural and wooded areas. Verizon seems to be the best in the Midwest. I once had bought a new phone right before going on an Amtrak ride from Detroit to Chicago- which means I even would've passed through Indiana probably not far from Delphi- anyway my new phone was on Verizon and the old one was on AT&T and both were still active so I used the train trip to compare service and Verizon pretty much never completely lost the signal while AT&T did a few times in western MI and Indiana). Heck, both AT&T and Sprint have given me massive issues in the western suburbs of Detroit which is more spread up and wooded than the other suburbs in that very densely populated area but that's a part of the state where a bunch of expressways come together (and that was what made losing signal so notable. I've gotten lost or turned off on the wrong highway because of signal drop). So hard to say or know for sure.
But definitely an issue worth considering. And it would even make sense. Somewhere (I think it may have been Gray Hughes in one of his videos but I'm unsure) estimated the time it would take to cross that bridge and it really wouldn't take that long. So either the girls stood around up there talking or whatever or it's totally conceivable then that they were already across before things uploaded. I'm unsure if that makes any real difference in the timeline but it could suggest then that the timeline is a bit different.
Lastly, one thing that I'm not sure of is that often, for sure with text messages and emails, while it will keep trying to post them for several minutes eventually if a signal isn't reached the phone will send you an error of some sorts or otherwise give up on trying. But I know Facebook, from experience, will send a post through if even after it didn't upload you open the app again even like ten minutes later or hours later as it happened to me and suddenly upload what it couldn't earlier. With texts you have to select to try again usually if it fails. Think I've seen it both ways with email. So I'm unsure of the specifics or if what I just said makes sense.
All of this said, and of course MOO, one thing I'm relatively sure of is that there's a very realistic possibility that those photos may have been taken at a time other than 2:07. Worth saying too that even if the signal was fine those photos themselves could've been taken sooner and only uploaded at that point precisely because the time stamp on Snapchat is the time of upload, not the time taken.
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