About logs you can refer to Logging ‒ Qlik NPrinting. You should check if there are some errors or share a copy of the log files.
You could also check if your hardware met the requirements Planning your deployment ‒ Qlik NPrinting or if you lack resources. For example, if you open the source document in QlikView Desktop from the Engine computer is it performing well or is it slow?
Is NPrinting Server and Engine/s installed on a reserved computer or are they in the same computer of a QlikView Server or Qlik Sense Server (not supported)?
Best Regards,
Ruggero
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