It would be useful to have menu option to see where file is located (i.e. internal storage, SD card, cloud, Dropbox, etc)
Also in the same sense of thought... add "Save As" or "Save copy as" function.
Reason for this feature is that so many times I will view an attachment from email, edit the PDF, save using Adobe Acrobat. Then compose a new email and I cannot locate the new edited PDF I just saved.