If I delete the photos in the sent/received file, does that delete them from every file in my gallery? I'd like to free up space if those are just duplicates but I don't want to loose the photos from my gallery.
We definitely want to make sure you are properly informed about the impact that deleting photos from your messages have on your actual device's gallery. Please tell us, what messaging app are you using? Are you saving these photos on your gallery? Are you backing up your messages?