I can tell you why you should use the add atttachments method and not use the copy and paste method.
Search the forum and find and answer to a problem discussed in 2011 or 2012 and an important photo of the fix is missing with a dumb photo bucket message.
Search for a layout design idea and find a wonderful layout with the photos missing. Same dumb message.
Find a thread of interest and the photo of the topic is so small, zooming the browser doesn't give you a good look.
Use the tools the forum provides and be considerate of other forum users.
Copy and paste is so Win98.