It seems that if you execute an ExportTileCacheJob and specify an existing tile package file location, the existing tile package is overwritten. I am looking for a way to make incremental calls to ExportTileCacheJob using an extent and/or scale level(s) of detail, and have the tiles merged/replaced in an existing tile package without losing tiles for the extents/scale level(s) that I am not requesting in the current call to ExportTileCacheJob. Is this possible? If not, has someone figured out a way to do this so I don't have to ask for full extent and all scale levels all at once whenever I want to download?
Thanks!