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Having problems with built touch screen

Ok, so we built a table with a tv hooked to a co outer with touch foil to make the tv a large touch screen tablet. Issue we are having is trying to draw freehand line, it senses the movement, but draws no line. If you double tap on the map area, it makes a single dot but no continued line. Anyone have any ideas how to correct for this please?
Unfortunately Roll20 really doesn't work with mobile devices or touchscreens, other than for simple display purposes.  There's a mobile app in development, but I'm pretty sure that's intended to be used as a 'second screen' to view/roll from character sheets while playing, not as a substitute for using a regular computer with a mouse to interact with the virtual tabletop.
Would you happen to know of any alternatives that would work? It’s a real bummer to find out this idea isn’t working as planned 
There is an extension for Google Chrome called Touch20 That's may help you...
That worked!! It’s running fantastically now!! Thanks so much!