there comes with a issue about the CanvasSnapshot,
e.g.
first test:
     -on the start of layout -- system take snapshot of canvas 
                                        -- LoacalStorage set item "snapshot" to CanvasSnapshot
                                        //-- wait 0 second
                                        -- check "snapshot" exists
     -on " sanpshot" exists  --  text  set text"Snapshot exists"
                                         -- sprite load image from LocalStorage.ItemValue
then, text shows "Snapshot exists", but sprite load nothing...
another way the same step:
    -on the start of layout -- system take snapshot of canvas 
                                        -- LoacalStorage set item "snapshot" to CanvasSnapshot
                                        //-- wait 0 second
                                        -- check "snapshot" exists
    -on " sanpshot" exists  --  text  set text"Snapshot exists"
                                         -- sprite load image from CanvasSnapshot
then, text shows "Snapshot exists", and sprite load the CanvasSnapshot
so does the localstorage cannot save the CanvasSnapshot?
 how can i take the CanvasSnapshot then save it or load it?
looking forward to your replies, thanks!