Using chart.umd.js to create chart

Hi,
I have a large amount of data to display (around28K) as a bar or column chart - it is a recording of motion over several hours. I'd like to do this without resorting to an internet connection and have been trying to use chart.umd.js without success. I have an html file and chart.umd.js uploaded as assets, and, as far as I can tell, the data that I'm passing (just a dozen test values, not the full fat version) is ok - but no chart is appearing.

Could I please ask if anyone has used this method, or can suggest an alternative that doesn't require an internet connection to function.
Many thanks...

Thanks for that, will read up.