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Tableau Server has a security feature which limits the protocols which can be used in a URL Action, I don't know for sure, but I'd assume Tableau Public does, too. It may be that Public is therefore explicitly disallowing the use of protocols beyond things like http:, https:, mailTo:, etc. in a URL Action:
Should be OK: http://something
Should be be Denied: file:\\c:\path\to\some\file
On a Tableau Server you own, one can use vizqlserver.url_scheme_whitelist to add additional protocols to what we allow out of the box:
vizqlserver.url_scheme_whitelist Specifies the protocols to whitelist when using URL actions on views and dashboards.
mailtoare whitelisted by default.
Your problem is that there's no way for YOU to add Google Docs protocol needs to the whitelist of Tableau Public.
Thanks for the explanation. I just rechecked & found that none of my URL action is working here. Checked again in my desktop & found that these actions are now not working in my dashboard also. These actions are working fine in worksheet but not in dashboard. I was unable to find that why this is happening. Can you please download it & look into this.
One more thing I want to share that https is working in Tableau Public & one example is here - How to Turn a Viz into a Poll | Tableau Public