A global field, by definition, has the same value for every record in the table.
Don't use a global field, and you will only have the file in whatever record you stick the file in.
Better yet, make a globals table that only ever has one record, and the fields to store preferences and template files like this.
Another option, keeping your schema as is, would be to stick the container in the header portion of your layout, instead of the body. That way it would only show one instance of the global container, rather than repeating it for all rows.
Think I might make a download button with a URL link to the file on dropbox. Thoughts?
If you're only providing a single file, then there's really no point to using an entirely different external service.