I am able to link documents to tasks by copying an Evernote link into a task's note field. It would be better to have this directly contained in the task. Ironically, attach a file is available in this suggested topics input screen.
This product really needs the ability to attach/share documents on tasks.
I'd settle for the note link working on the web and Android
I think I've figured out a temporary "work around". I'm placing the document(s) I want to "attach" in Dropbox then copy/pasting the link URL into the comments or notes. It's not the best but at least it allows users on a shared task to be able to retrieve and look at a document related to the task.
Yes, it's a bit clumsy but it at least lets me share the documents.
This is a needed feature.