> For the complete documentation index, see [llms.txt](https://eventx-hq.gitbook.io/knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eventx-hq.gitbook.io/knowledge-base/check-in/troubleshooting-and-use-cases.md).

# Troubleshooting & Use Cases

Solutions for common check-in issues and step-by-step use case walkthroughs.

## Troubleshooting

* [**How to Fix Check-in QR Code Not Showing in Emails**](/knowledge-base/check-in/troubleshooting-and-use-cases/unable-to-view-check-in-qr-code-in-confirmation-reminder-emails.md) — QR code image blocked in Outlook or Hotmail. Unblock automatic picture downloads.
* [**How to Fix Check-in QR Code URL Not Clickable in Outlook**](/knowledge-base/check-in/troubleshooting-and-use-cases/use-case-unable-to-click-on-check-in-qr-code-url-on-outlook.md) — URL renders as plain text. Wrap the merge tag as a hyperlink or use "Show blocked content".
* [**How to View Daily Attendance on the Check-in App**](/knowledge-base/check-in/troubleshooting-and-use-cases/use-case-how-to-view-daily-attendance-on-eventx-check-in-app.md) — Use breakout sessions (one per day) to track daily attendance counts.

## Features

* [**How to Set Up VIP Arrival Alerts**](/knowledge-base/check-in/troubleshooting-and-use-cases/vip-arrival-alert.md) — Get email notifications when tagged VIP attendees check in. Enterprise plan only.

## Common Questions

* **Q: The attendee's QR code won't scan — what do I do?** — See [Check-in App Error Messages](/knowledge-base/check-in/check-in-app/check-in-app-error-messages.md) for all error scenarios and their solutions.
* **Q: Can I use the Check-in App on Android?** — Yes, Android 10+ is supported. Download from Google Play Store.
* **Q: How do I display a PDF on the EventX WebApp?** — See [Use Case: Display PDF on EventX WebApp](/knowledge-base/event-setting/event-webapp-and-ux/use-case-how-can-i-display-a-pdf-file-on-the-eventx-webapp.md).