PNG transparent background not workimg

Whenever I download a png transparent background file to my iPad it has no background but when I either airdrop it or it downloads from iCloud to other Apple devices it adds a blank white background. YES I HAVE CHANGED OPTIMIZE SETTING, it didn’t do anything at all. I also tried changing the quality of the image before airdropping. It’s really frustrating because the whole reason I got a MacBook was to easily transfer images from iPad/ iPhone to my Mac.