A. 1. Check file size and format: Ensure that the attachments you are trying to send are within the size limits and in a supported format. 2. Clear app cache: Go to Settings > Apps > Criptext Secure Email > Storage > Clear Cache to resolve any temporary issues with attachments.

B. 3. Try sending attachments in smaller batches: If sending multiple attachments, try sending them one at a time to see if it resolves the issue.