The invention discloses a method of sending pictures for display individually or as a series of pictures in a mini-clip on a receiving device during a lengthy file transfer. The invention, although not strictly limited to, is particularly suitable for use in a Bluetooth environment using the Object Exchange (OBEX) protocol. In an embodiment of the invention, a picture or series of pictures (710,720,730) are encapsulated within a Application Parameters header of the ongoing long file transfer. When picture data is too large to fit into a single header the data may be segmented and spanned over several headers. The headers contain parameters that define display characteristics such as picture display time and mini-clip or series refresh rate, thereby lending the method particularly well for the display of advertising content.