Lost powerpoint attachment

What I did: Attached a .pptx document to a meeting note.

What happened: Document is shown as attached, but is not in Dropbox, it is completely lost aside from the thumbnail, and none of the buttons work when clicked. See picture:

What I expected: To be able to open the file and edit it in Powerpoint.

Things that might be helpful to know (Findings version, OS and model, etc): Findings 2.1, Build 5648.9acf5aba, Pro-subscribed, macOS 11.1 running on 2017 13-inch MacBook Pro