I just realized that there is a feature to utilize anki Droid as default flashcard program. I have it set up that new cards move over, however I don't know how to move existing cards. What am I missing?
For that, you'd need to temporarily disable AnkiDroid integration, then export your flashcards to a text file - you can reimport that into Anki as tab-delimited text. (and then turn back on AnkiDroid integration to proceed with creating new cards in Anki)
In theory, but to be honest we haven’t had many requests for that so it’s not something we’re inclined to prioritize over other stuff people want from our AnkiDroid integration. (more formatting options, e.g.)