There's a chronological gap in the photos that had been backed up on my iPhone's camera roll?

I dropped my phone in water and had to get a new one. Of the photos I was able to recover, there's a gap in the time the photos were recorded… So I was able to recover older photos up to a certain date, then about a 5 month gap, and then photos from the end of the gap to a date pretty close to when my phone broke. I don't understand how the more recent photos could be backed up, but not the one's from the gap. Can anyone explain this and is there anyway to recover the missing photos?

I'd guess that the water caused it.

Being on your iPhone's Camera Roll is not considered "backed up", because Camera Roll is on your device (the thing that got soaked). Storing them on an external device or in the cloud is "backed up".

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