Cannot create (PDF) file

I have always been able to attach a PDF file (s) that I had previously created to outgoing e-mails.  Suddenly, this stopped working.

 

I now receive the following message in Microsoft Outlook when attempting to attach a PDF file.

 

"Cannot create file.

(then the file name, etc)

Right click the folder you want to create the file in, and then click Properties on the shortcut menu to check your permissions for the folder".

 

Has anyone also run into this problem?  If so, how does one correct it?

 

Any help or advice would be appreciated.  TY!