[cemerick]

Yeah, I can totally understand that. I'm very glad I dug into what's actually going on in the background though -- given the name of the feature in the UI (attachments), I completely expected that referenced files were being included in the saved OP file. I can definitely see people putting together a project plan, "attaching" some files with original data, and then deleting the "attached" files.

IMO, you may want to consider calling that feature "linking" in v2.0, and providing a command that will pull together a .zip archive containing all of the linked files and a copy of the OP file that resolves all of the linked files using a relative path.