Welcome to Android Central!
Can you describe a little bit more what you want to do?
Best regards,Mikey. I hope you found what you were looking for.
Sent from my Samsung Galaxy S7 Edge SM-G935F.
Welcome to the forums. Are they pictures sent via MMS or from a different texting app? In general, if you tap or long press on the picture a menu should open with the 'save' option included.