Genius Scan App
Its like having a scanner on your phone. Genius Scan is a free app that uses your phone camera to turn a photo into a pdf, just as a scanner would. Once you have the new pdf, it saves into the documents or the iCloud Drive. You can send an email (fax, Dropbox, Google Drive, print, etc) directly from the app.
There are all sorts of handy features too. You can make it password protected for the recipient, use it for e-signatures, touch up the image, or scan many images at once to create a "batch". Super handy for keeping up with the paperwork (eww) while on the road!