When you view an email with attachments, tap on the attachment to start downloading it.
Tap the attachment body to open it, or tap the download arrow icon to save it. Downloaded files go to your Downloads folder.
PDFs open straight inside BlueMail on Android — tap the attachment and it opens in the app's own viewer, with no "Open with" prompt and no separate reader to install. BlueMail can also open PDFs that didn't arrive by email: see How to Change the Default PDF Viewer on Android.
Other file types open in whichever app on your device handles them.
BlueMail does not auto-download your attachments in order to save your network resources.
