I seem to be able to tag articles, do you not have an "Edit Labels" option in the article menu? Regardless, they definitely were lagging on Android development, but it was still finished enough to use it. There's even a version that supports pagination: https://github.com/tent4kel/omnivore/releases/
When you're actually creating an entry via the share prompt there are no options at all unlike the browser extension (for Android at least)
So yeah, you can tag it.. if you exit your current app, find Omnivore in your launcher, open the app, find the entry you just made, then edit it, then add tags.. but that's a terrible UX.
Ah yeah, the share dialog is really basic, I ended up using Firefox and installing the full extension when I wanted to save pages (also allows you to save pages from places you're logged into)
