int file_number, double fraction_complete)
Enables its caller to report to the user on the progress of a publishing operation.
| file_number | the sequence number of media item that the publishing system is currently working with, starting at 1. For example, if the user chooses to publish 4 photos, these photos would have sequence numbers 1, 2, 3, and 4. |
| fraction_complete | the fraction of the current publishing operation that has been completed, from 0.0 to 1.0, inclusive. |