Using my Samsung S5 email app I get an email with a PDF attachment. I scroll to the bottom of the email to "load (or see) details". Then I touch the attachment and it scrolls to the right where I can either Preview or Download the PDF. touching either option results in the following Warning message, "You must first download the message to download the attachment." No matter what I do it keeps telling me the same thing. I have to download the message before I can view or download the attachment, but there's no where to download the message. My mind works like this, if I touch the download button, that means I want to download it, so download it already, don't tell I need to download it!!!
