I recently updated to Big Sur 11.6.6 and now can't open pdf documents which are emailed to me

Hi,

Recently set up Big Sur 11.6.6 on my Mac and now can't access pdf documents which are emailed to me. I cannot open them when I click on the icon in the email via apple mail, but they appear in my recents folders which I can open?

The message I get when trying to open via mail is attached.

How can I resolve this?

Thanks

W