Systems and methods for facilitating access to files that are stored by network-accessible file storage services. An example system comprises a plurality of file access nodes including a control node, wherein the control node is configured to: receive a file access request initiated by a client, wherein the file access request comprises an identifier of a file, an identifier of a file storage service, and an access token associated with the file stored by the file storage service; request, using the access token, metadata associated with the file from the file storage service; define, using the metadata, a plurality of portions forming the file; and forward, to the plurality of file access nodes, identifiers of the plurality of portions.