I would like to understand if there is any way to do thumbnail preview in salesforce on file upload

I tried implementating the below but apparently it does not work without paura package/framework and I am not sure how to install


If there is any other alternative code for thumbnail preview, that would also be really helpful.

  • You can write your own via the FileReader/HTMLCanvas interface. Any generic version of this should work, as Locker Service does not restrict it. – sfdcfox Mar 25 '19 at 1:40

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