My iPhone had about 50 GB of photos Bang now 200 ?

I don't know what triggered this activity....How did the 160 GB Magically download on to INTO my 256 GB iPhone12 pro ! AND foes some one understand = DOES THIS REPRESENT ALL OF MY ICLOUD DATA? Please I do not know How this happened- And Truth B Told= ok so I want OUT OF ICLOUD . BUT NOW WHAT do I do HOW DO I KNOW is this The LOT OF IT? AND now How to get off my phone and onto External HD/ DONGLE? Please Tell me in a persons words, I have rough time Cognitive Understanding, Im Petrified. When trying to Follow directions, See sure I can read a paragraph - this is not mean I KNOW what CONTEX TO USE WORDS or what they reference, This us true Its awful! All I know is if I agree to UPGRADE "now" Photos and so many other things become Out of my control, And Apple Leaves Me Linda With a conundrum-- I NEED MY DAYS BACK, my data safe and ability to use and have in my hands, My iPhone 6 That is gone as well Will said its all there in iCloud if it is " how do I confirm? PLEASE SOME BODY TELL ME WHAT TO DO.

linda