Storage issue
there are only 600 photos in this iphone(I bought it recently), only these few pictures are taking 50 GB of storage. Why? Because I know it’s not normal.
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you need to check your iPhone storage to know what's taking up all your space
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
if you see 'other' storage is high, you can try this if you're using an iPhone 6s/6s Plus or newer
Clear Other storage on your iPhone or iPad - Apple Support