How to display multiple uploaded files

a!documentViewerField() supports only one document, depending on how you need to display you have to use foreach in grid.

https://docs.appian.com/suite/help/23.4/recipe-display-multiple-files-in-a-grid-for-editing.html

Replace linkfield with the documentViewerField in above example.

Personally, I'd use a foreach to display each of the file names (or some other identifier), and allow the user to select one at a time to display in the document viewer. Because the document viewer takes up so much screen real estate, it's not very practical to have multiple instances.