No, as long as you upload the pic to CU there should not be any firewall issue. I do notice that you have the /'s wrong, and are you trying to use your harddrive to show the pic? That won't work, you have to upload the pic using a hosting site, or the CU server.
Comments
I don't think you have your url right.
Go practice on the testing forum, then post on the U.S. Coin forum, that's where to get your answer
By the way---
https://us.v-cdn.net/6027503/uploads/oldattachments/morgan 1889 back
should be:
http://forums.collectors.com//attachments/morgan 1889 back
Thanks