How do I remove sent/received photos and attatchments from yahoo mail?

There is no way to remove any kind of attachment from the email. If there's some sort of important content in the email you need to save, copy and paste it wither in to a document on your computer, or into another email if you want to send it to others, or if it's something you want to save but want easy access to, compose a new email, paste the content there, then save it as a draft. That way it's always there if you need it. Then you can delete the original email that had the attachments.