The built-in BuddyBoss vBulletin forum importer (based on the bbPress vBulletin importer) does not handle attachments during the import process. I need to overcome this in one of two ways:
1. Add this capability to the BuddyBoss vBulletin importer (Codex Docs [login to view URL])
2. Create a script that will loop through all the topics and replies in the vBulletin DB and add any attached images as an html image tag (ie <img src = "image-url" class="migrated-image" /> or pdf,doc,htm,html attachments as <a href="file-url" class="migrated-file">filename</a> directly into the topic or reply field. This way the images will at least be referenced in the data that the importer does bring over, and I can do a find/replace on the url in the wp_posts table and manually bring the actual image/attachment files over, and manipulate the images and file links with the "migrated-attachment" or "migrated-file" classes.
3. Come up with a better solution