Want to start a fight among mobile/digital photograhers? Just ask them which is the best photo app. There are zillions. But in our opinion, nothing beats Adobe Lightroom for manipulating high-res images in-app, post-processing. Lightroom might not be the cheapest, but it’s arguably the best. See the iOS version at https://apps.apple.com/us/app/adobe-lightroom-photo-editor/id878783582. Android is available now too. Both are free — sort of.