In document viewer field, a random string is showing in the viewer header rather than the name of the document?
How can I fix this issue?
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I do not know of a way to "fix" this. AFAIK Appian generates a random string to present the PDF to the browser built in PDF viewer.
As far as I know that's the standard way this component works.
In the viewer header you will see the PDF title, not the document name. If by any chance you generate this PDF directly from Appian using 'HTML to PDF' plugin, try adding the title tag
<title> PDF title </title>
On the other hand, if you receive it from any external service, try contacting with their respective team
It was received from external system and we updated the pdf title, that worked. Thanks