In desktop versions of Firefox, it is relatively easy to view the page source for documents, images, videos, etc.
The metadata, usually within the first few lines of gobbledygook, will tell you if the material was generated, sometimes which AI, the prompt, and other information.
None of this is available (that I've been able to find) in the mobile app. This is is a serious defect. We all need to be able to check this easily.
Additionally couldn't your platform render metadata "<title>video generated by ai free at DuckDuckGo</title> for example, with a symbol so that we could just see at a glance?