Shiny app: downloadHandler does not produce a file

Note the download button does not work in the RStudio viewer. Your
friend might be using the RStudio viewer to view the app. If that is
the case, please open the app in the external web browser (there is a
drop-down list on the right of the “Run App” button: Run in Window,
Run in Viewer Pane, Run External; choose the last one).

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