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Once I download them, I rename them all to "01.png", " 02.png", etc and zip them up. Then I rename that to a .cbz file and import it into Moon+ Reader, my preferred eBook/comic app.

I'm not sure what app that is, but Photos orders images by age so you could move them from one directory to another, one by one, last page to first page, to get them to show up in the right order. You could also try renaming them to numbers with the same number of digits. In some conventions "10.png" comes before "2.png", but if you renamed it "02.png" that should preserve the order.