When I release a document, the Printix App displays "Working on it"

If you are releasing a Print Anywhere document to a printer you did not use before, it may require your computer to first add the printer. This may take 1–5 minutes depending on the print driver. During this time, the Printix App displays the state Working on it before transitioning to Printing and then Printed. The printer is kept after printing, so it does not have to be added again when you release subsequent Print Anywhere documents.

Resolution: Wait for the print queue to be created.