I'm pretty sure this is a bug:
I have a banner with a link defined as "navto://collection/september_october_2016/article/so16_oow_preview". The banner is used on the "september_october_2016" collection browse page. In this context, the link sends the user to the first article in the collection, not the article named in the link.
If I put this same link on a banner in a different collection's browse page, it works fine. In other words, it appears that the "navto://collection/[collection_name]/article/[article_name]" format doesn't work if you are trying to point to create a link on a banner that points to the same collection that contains the banner.
This problem only occurs in iOS preflight apps, not Android preflight apps. I tested with version 2016.11 in both cases.
A "navto://article/so16_oow_preview" link works fine, but then I don't get the ability to swipe left or right to adjacent articles in the collection.