Here are a few steps to help resolve issues with email attachments not opening on a mobile device in Exchange:

1. Check file type compatibility: Check that the file type is supported by the mobile device’s installed applications.


2. Check file size limit: Exchange has a limit of 25MB for file attachments. Check if the email attachment exceeds this limit.


3. Check for errors: Many email applications and programs have a built-in error checker. Consult the help section of the specific app to check for any errors.


4. Restart your device: Close the application and restart the device. This may help with resolving any attachment-related errors.


5. Clear cache: Clearing the cache on the email application regularly can help improve performance and may resolve any attachment-related errors.


6. Contact Exchange Support: Exchange support is available to help investigate and resolve any further concerns regarding email attachment issues.