I'm thinking about the timeline of Spiderverse films because wait a damn minute.
At the beginning of ATSV Miles says he's been a Spiderman for the past year and four months. So the first film and second film are about a year apart.
But that would also mean that Miguels universe had collapsed just a few months back.
The scene we see in the first film with Miguel, he is obviously way more happier, he's (kinda) joking and his voice is way more full of life than in ATSV. In that scene we also see that Lyla had made a prototype of that watch they later use to go from universe to universe.
This was possibly even before he found the universe where his other self died so he could take his own place.
And we know for a fact that that universe collapsed after he started the Spidey society, because we see multiple Spider-people trying to save people from that universe, including Peter.
This would also explain why he's still looking at videos of his daughter. It's been just a few months, hell maybe even just weeks since that universe collapsed. His grieving is fresh and he still needs time to properly process it.
Makes me wonder if Gwen also saw how his universe collapsed, because she says to Miles it's been a few months since she joined. They maybe didn't bring her to help because she's a kid, but no one says that she couldn't be in the HQ when it happened.