January 19, 2021 (edited) , 翻译为ZH (显示翻译) , 从EN翻译 (展示原始文件)
If you log in to an old account your old cards should already be there. If they are not showing go to the settings page, enable "Advanced settings" and click on "Rebuild collection". If after that the cards are greyed out you will need to download them or copy them from a backup.