Methods and apparatus implementing techniques to embed files in an electronic document. User input specifies files to be embedded in an electronic document and metadata to be associated with the specified files in the electronic document. The specified files are embedded in the electronic document in response to the input. A manifest is created in the electronic document. The manifest includes representations of each of the embedded files and the specified metadata. Each representation of the metadata is associated in the manifest with representations of one or more corresponding files of the embedded files. The manifest includes presentation information defining how the representations will be presented to a user.