Did you setup a "Public" folder in Dropbox? Otherwise, you cannot direct link to photos.
Should be in this format: https://dl.dropboxusercontent.com/u/
201045551/Forums/Media/1stBattleofBullRun.jpg
This is what your URL photo link looks like:
https://www.dropbox.com/s/t756s4k8lc4x2jc/bracket 20repair.jpg
This cannot be displayed in a forum post as it's not actually a photo link, but a webpage link. You can make a clickable link instead.
You can try extracting the URL for each photo, but I wouldn't advise doing so as Dropbox could easily block the embedding of photos on their side at any time. Better to setup a Public folder.
Or use this forum photo upload utility at
bit.ly/photo-upload.
