I have a use case to not to allow the user to download the pdf document but he should be able to view it.Do we have any possible ways to achieve this with or without the PDF Viewer in Appian?
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I don't think you can do that. You can look for plugins on the App market but nothing more.
Plugins are there, but there is watermark coming along with this.That doesn't solves the purpose.
There should be a way to pay and get rid of the mark if restricting a user from downloading is really important. Additionally, if it is a single-page PDF, you can display it in an image field. It won't be crystal clear, but will serve the purpose.
Thanks for the directions Harshit