BlueMail supports adding an attachment from your photos or videos libraries, documents, PDFs and other types of attachments. On Android, PDF attachments open directly in BlueMail — just tap the attachment (see How to Change the Default PDF Viewer on Android if you'd like BlueMail to open PDFs from elsewhere on your phone too). Other file types open in whichever app on the device handles them, based on the recipient's preferences.
To add an attachment to your email, get into Compose mode (or Reply, Reply all, Forward and similar actions), then tap the attach (paperclip) icon directly on the Compose screen and select your file(s).
On Desktop, you can also use the drag and drop feature to drag your file(s) into the Compose window.
