Locate the attachment summary bar at the bottom of the open email message. Thunderbird's attachment summary bar shows the name of the attached file, along with its file extension, such as PDF or ...

If you are unable to open PDF attachments in Yahoo Mail, first try restarting your computer or device. Other programs might be interfering with Yahoo's ability to access your PDF reader program ...

In Attach File mode, the PDF will be inserted as a simple file attachment. You can double-click on the attachment to open the PDF file. While in the Insert Printout mode, ...