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Since I download the latest update, I cannot find my camera
My suggestion would be to do a hard reset. Hold the power & home button at the same time until you see the logo. Then release the buttons and wait for it to finish. This works on phones up to the 6s/6s Plus. If you have an iPhone 7 then hold the power and volume down button together until you see the logo. Then release the buttons and wait for it to finish. Hopefully this will solve the problem for you. Thanks!
If that doesn't work try spotlight search. Type camera into the search field and on the results on the far right should tell you where camera is located.