Over the past year I have encountered the following annoying and sometimes embarrassing problem with Mail on my Mac.
It seems that sometimes (apparently randomly to me) it strips attachments from incoming emails. A first I thought the sender had forgotten to attach the file, as sometimes happens. I asked them to resend it. Sometimes the attachment comes through on a second attempt. Other times it does not. The size does not seem to be relevant.
I thought the university system might be stripping the attachment and so I looked on the UQ Webmail and found that it was there in the original email there but not in Mail.
I welcome suggestions. I looked online and found other people with this problem, but no clear solutions.