Heya TubeBuddies! We have an ongoing outage and have identified a bug for Card and End-screen feature, due to the same, you will not be able to use our bulk card and end-screen tool . Our developers are working on the issue as we speak, we really apologise for the inconvenience caused due to this. Once the issue has been resolved or If we have any update, we will make an announcement about the same. Thank you for your patience over this! For more information, you can check - HERE!