Gmail has made it easier to attach photos to an e-mail message. When its new compose window was rolled out earlier this year, when you dragged and dropped a photo into a message, Gmail added the photo as an inline image in the body of your message.
Now, the compose window features two separate drop zones for images you are dragging over. The larger of the two in the body of a message instructs you to "Drop files here," which adds photos as inline images. Below, a smaller area instructs you to "Attach files here," which, you guessed it, adds photos as attachments.
If you got out of the habit of dragging and dropping images to Gmail because they would not get added as attachments, you can now resume that practice.