What FANDOM app, the new one or the old one?

I've edited your post title to make it clearer. In future, please describe your issue more clearly in the title. 🙂

Also, please do eleborate what exactly happens when you try to post something. Do you get an error, and if you do, what does it say?

To be clear, the old one is deprecated and the new one is buggy

Wait, there's two fandom apps?

The old one is a remnant from an old legacy project, and the new one is another UCP venture to standardize everything in mobile

Could U tell from a screenshot