Represents a document to be attached to a template via an externally-accessible URI. A copy of the document will be
downloaded from the specified URI. Note that the URI will be accessed without headers or other authorization methods
set, so the URI itself must encode any security tokens or keys required to access the file.
Represents a document to be attached to a template via an externally-accessible URI. A copy of the document will be downloaded from the specified URI. Note that the URI will be accessed without headers or other authorization methods set, so the URI itself must encode any security tokens or keys required to access the file.