Or you could add them to the iCloud Photo Library on your computer and then edit them from within photos either natively or by using another editor that supports photos extensions
Or you could use Lightroom and Lightroom mobile
Neither of those options need you to make multiple copies of a photo and work seamlessly
I really don't want to pay for Adobe subscription. I'm a hobbyist photographer and would just like to edit photos on the go.
I did try the iCloud Photo Library solution. Unfortunately it just got stuck on "Uploading" for days so I just turned it off.