Hi Jessica,
Is your Trello app up-to-date? Are the card buttons available after closing the app completely and then reopening it? To close the app, double-click on the Home button or swipe up on the Home indicator to access the app switcher and then swipe up to close the Trello app.
If you're still running into the same trouble, would you mind clearing the Trello app cache to see if that fixes the issue? Before you do so, please take a look at this help doc that explains how to check for unsent changes first and it explains how to clear the app cache after that: Troubleshooting for the iOS app
In a situation where the issue persists after clearing the app cache, we'd suggest reinstalling the Trello app using the following steps:
- Delete the Trello app from your device
- Download the latest version of Trello via app store
- Launch the app again and log in to see if the issue persists
Let me know how you go with this or if you have any more questions.
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