You don't say which email client or web service you are using. They treat these files differently. Photo files can usually be sent two ways- as an attachment, which usualy require user input to open them or in the body of the email where they will show when the email is opened, unless the email client or web client doesn't allow this for security reasons. Have you updated or upgraded your email client, operating system or has your web email recently been updated? A little more info as to what you are using would help.