Including local File-based Document Attachments

To actually embed an attachment such that it is included with your project and content, attach a local file:

Use the link dialog's file-browser button to choose your local file:

Once the file has been selected, notice that its Link URL has a "/previews/" path, just as with the embedding of local File-based images:

WARNING: do not change the Link URL, lest the embedding not succeed.

Just as with File-based images when they are initially inserted into the rich-text editor, the attachment is not yet processed nor fully embedded, and shows a temporary previews URL. And again, as with images, once you click on the link dialog's Insert button, you may then click on its iDevice's green "Done" check mark to fully process and embed the new attachment.