Here are five key steps to troubleshoot the issue with email attachments not being saved or downloaded:

1. Check if the attachment was overly large: Certain email applications may limit the size of attachments which can be sent or received.
2. Check browser settings: Ensure that the browser is enabled to download attachments without blocking them as different security measures may filter downloads.
3. Check mail spam filter: If the mail attachment is not showing up in the inbox, it may be caught up in the spam filters and incorrectly labeled as a suspicious mail.
4. Check the account settings: Make sure that the account settings are set in a way to be able to receive and save the attachments.
5. Try downloading the attachment on different devices or browsers: Testing the same attachment in different applications or devices may help identify the solution.