It is possible that attachments are blocked or deleted by your email provider due to security or size limitations. To troubleshoot this issue, follow these steps:

1. Check your sent folder to see if before sending you had correctly attached any files to your email.
2. Check the size of the file you are trying to attach. Some emails don’t allow files larger than 5MB.
3. Check your email settings to see if any restrictions for file types have been set.
4. Contact your mail server to check whether any attachments have been blocked.