Backup Methods for iPhone

I have a iPhone 7 and I want to transfer all the images and videos to my laptop however I don't have an Apple Laptop only my windows laptop. I have tried using many methods but none worked well. Directly connecting the phone to my laptop and then manually copying files from the DCIM folder results in missing out most of the stuff. Importing also doesn't work as it seems to have copied files but is saved in some unknown location which I cannot find. I also downloaded the ICloud App for my laptop but it didn't help either.

I'm using IOS 13.6 on my iPhone and my Laptop runs on Windows 10 Home Edition.

You need to install iTunes for this, see https://support.apple.com/HT210612 for details.