A client-server computer system includes a client-side application executing on a computing device, operative to communicate with a native application executing on the computing device to obtain and store a multi-media content file generated using the native application in a native content file format. A server includes a server-side application operative to communicate with the client-side application, and operative to: create an association between the multi-media content file, a recipient computing device, and a courier tracking number; determine that delivery of a parcel associated with the courier tracking number has occurred; and transmit the multi-media content file in the native content file format to the recipient device in response to determining that delivery of the parcel has occurred.