LG G5 Camera Photos Are Black With Exclamation Mark

My friend took some photos on my phone in the dark whilst fishing and the pictures have come up with a black screen and a triangle with an exclamation mark in the middle, I have gone on the details and it says flash did not fire and the picture resolution is -1x-1, he took around 30 pictures and only 3 came out, I have recently restarted my phone and now all the pictures have gone including the ones which were OK, all my other photos are ok

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