How to select multiple images to add to another app on your iPhone or iPad | Apple Support

To grab and move multiple images on your iPhone, first, touch and hold one photo until you feel a tap, then drag it away while continuing to hold it. With another finger, tap additional photos to add them to your selection. Once you’ve selected all the photos you want, switch to the app where you want to share them while still holding the stack. Drag the stack to the desired location in the app and lift your finger to drop the photos. This gesture also works for moving multiple apps or emails.

Summary:
– Touch and hold a photo until you feel a tap, then drag it away.
– While holding the first photo, use another finger to tap additional photos to add them to the stack.
– Switch to the app where you want to share the photos while holding the stack.
– Drag the stack to the desired location in the app and lift your finger to drop them.
– This gesture also works for moving multiple apps or emails.