One of the things that I was unable to migrate is the old attachments, including images that were uploaded to posts. Images that were linked offsite (e.g. Dropbox, Flickr, etc…) work fine.
I do have a backup of all of the attachments and old posts, however it was too manually tedious for me to go through several thousand posts and move the attachments manually.
If there are specific posts that have attachments that you would like to have restored, request it in this topic. Just reply with a link to the posting, and I’ll take care of it.