AnkiPro supports popular .apkg and .colpkg formats for storing flashcards, which you can find across the web. To upload a deck in either format, simply select the option when creating a deck.
You can also transfer your card progress along with your cards!
How to Export from Other Anki Apps?
Step 1: Open the desktop version of Anki.
Step 2: Choose the deck you want to export and click on the "Export" option. Make sure to check all the boxes!
Step 3: If you wish to export the deck with its progress, select the corresponding option before exporting.
Step 4: Import the exported file to AnkiPro. Hint: You can use ankipro.net and simply drag and drop the file there.