I know you don’t want to embed actual files into tasks, but it would be very helpful to be able to link to documents as attachments in the task from services like Google Drive, Box, OneDrive, or Evernote.
I am aware that I could copy the link, and paste the link into the notes and have Everdo create a link that is shortened to something unintelligible. But it would be a lot nicer to have a GUI to add a file and then have it show up as nice clickable link and perhaps even a thumbnail.