caching - Map server not using Lizard Tech cached tiles -

i using lizard tech serve satellite image tiles have processed myself...i have turned caching on in lizard tech doesn't seem mapserver using cached imaged tiles...is there configuration or else missing happen?

here map file looks like...

map imagetype      png24 config "proj_lib" "path to/projlib/" extent         -180 -90 180 90 size           256 256 fontset "path to/fontset.txt" imagecolor     255 255 255 transparent on projection     "init=epsg:4326" end web metadata   "wms_title" "water"   "wms_enable_request"  "*"   end end      layer      name         "aerial"     debug        5     status       on     type         raster         connection "http://path lizard tech/ows?"     connectiontype wms               metadata            "wms_title" "sometitle"            "wms_srs" "epsg:4326"            "wms_name" "aerial"            "wms_server_version" "1.1.1"            "wms_format" "image/png"            "wms_exceptions_format" "application/vnd.ogc.se_xml"            "wms_enable_request"  "*"     end         projection           "init=epsg:4326"         end   end end