I've got two posts that are live-- one that is a monthly product update, and another asking for feedback on a specific new feature. Both have the same audience, and are meant to appear as soon as the user logs in.

If the user logs in when the first post is set live, then logs in again when the second post is set live a few days later, then there is no issue: both posts have great visibility. My issue is, if the user hasn't yet seen the first post before the second one is set live, when they log in, they just see the very first post pop up; to find the second post, they have to go to their message history, and the post is marked as read already. Ideally, they'd get two pop-ups for both posts. I have tried setting this second post to "large", hoping that perhaps the difference in format would mean both would appear, but it seems not.

I also haven't found a filter that would enable me to show a post only if another post has already been seen; would the "last contacted at" filter work in this case? Is this only possible through Series or can it be done without?

Thanks a lot for your help!