Why is my photo transfer from iPhone 7 to Mac missing many photos and how to I retrieve them?

I had resriction codes I wanted to get rid of so I backed up my photos with the help of apple assistance, and AFTER I restored my phone to a new phone I noticed there's a big gap of missing photos. It isn't that it only saved old photos, because iPhoto has my most recent photo, but before that is missing 4 months of picture, please help me.

"Why is my photo transfer from iPhone 7 to Mac missing many photos and how to I retrieve them?"

Obviously, a rare glitch caused some photos not to copy. Just repeat the photo copying from the iPhone to the computer. Since the dawn of electronic computers (1937), rare glitches do occur.

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