Hi,
In order to fix the issue more efficiently, I'd like to collect answers for following questions:
Are you using Microsoft Outlook as your mail client on your laptop?
Which type of email account do you use in your Outlook? IMAP, POP3 or Exchange?
Did you get any error message when it failed to send the attachment?
Does this issue happen to all attachments you are trying to send or just certain one?
Have you tried sending the attachment to another email address and see whether it succeed?
Regards,
Steve Fan
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