I have been noticing this for a little while, and am curious if it's a bug or setting or what.
Frequently, I will see one picture in the picture archive. When I get to the post however, there are several pictures; most of which were not included in the picture archive.
For an example, I give you the post by Kayden's. I only had one picture in the archive, but she has 24 pictures on her post. https://umd.net/forums/topicid/718328
I don't believe this is a bug. The pic that's in the archive is the lead off pic she chose in the thread to promote that video.
I don't know much about how those kinds of posts work because I don't have a store. However, I'm guessing that the way the site works, it will only show pics selected in the archive.
MM may be able to give you a better answer. I'll forward this to him.
When it's a UMD promo post, it only adds the main picture to the archive, not the rest.
With the new promo tool, UMD literally dumps every pic from every plugged scene into the forum system. That's technically so they can be displayed just like pics in a regular post, allowing them to get loves (plus, be displayed in a normal pop-up, with forward / next buttons and all that). Producers had been requesting this for years.
But fearing all these pic dumps would easily overwhelm the pic archive with our own ads, I made it only include the main pic from each plug.
Sorry for any confusion... at some point I could add an option to just see them all on the archive.