If you have one of the sentence lists from our webshop in your target language, then there is nothing stopping you from using that list, as well as studying via the app. However, that list is likely to prove to be a little bit redundant. Why? Because in the app, you don’t need to refer back to your word list to learn words, since the app includes them and teaches them to you via the built-in lessons.
Note: As of September 12th 2019, we no longer provide official support for our Anki based pronunciation trainers and word lists. You are more than welcome to still purchase and use them, but the support we are able to offer for these products is limited. For supported languages, these materials are already built into the Fluent Forever app.