How to stop backing up on iMac when iphone is connected?

Guys, I need your help. So annoying that everytime I need to add files on my iphone from my iMac. It will do the whole back up first before I can transfer the data on my iphone and it takes a lot of time waiting. Is there any other option how to stop backing up iphone on my iMac? So disgusting and irritating you have to add only 3 photos but you need to wait more than 1 hour this is too much. I tried to change the settings on itunes preferences and delete the back up buttons but still it does everytiime I connected my iphone it will automatically do the back up.

Go into itunes and click the Options tab (I think) and somewhere in there you can uncheck a box that is set to auto-sync. If it's not the options tab its some other tab. I know I had to do it in Itunes though when I had the same problem

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