share
choose share in the three dots menu or in an open post. postpalm hands the actual photo or video file to the ios share sheet, so it arrives in messages, mail and other apps as a real file. for text posts it shares the link.
save to photos
choose save. the first time, ios asks permission to add to your photos. gifs are saved as real gifs.
open the original
choose view original to open the post on its own platform.
important
posts belong to the people who made them. share what you save only where you have the right to, and credit the creator. see respecting creators.