I had no trouble taking a screenshot with "take snapshot of canvas" and loading it later in my game, but I'm wondering if this will work (in NW.js) if the user is offline.
I'm asking this because the manual entry says: "The expression returns a data URI of the image file. This can be loaded in to a Sprite or Tiled Background object via Load image from URL" ( https://www.scirra.com/manual/126/system-expressions )
In my mind, an URL implies that the user is online, but I may be very wrong.
Thanks for any help!