What are the rules on uploading documents? I want to upload online newspaper articles to practice translating but is this acceptable?
Most newspaper articles tend to be copyrighted; you can only upload article that aren't copyrighted.
From the upload document page:
Translation is free for content released under a creative commons license."
For more information about immersion, see these posts:
And Dessamator ”Immersion Community Guidelines”
Is there an easy way of finding out whether an article has been released under a creative commons license?
This is a question I also have. Personally, I like to read El País and when I find articles that might be of interest to Duolingo users I would like to upload them, but that does not seem to be possible.