How to Upload Documents like Excel Files in Outsystems 10?

Currently reading this forum but seems outdated so I had to post another question.

This official document guide needs a rework:

This Youtube tutorial was in 2014:


How do I upload an excel sheet and display the the spreadsheet on a web screen?

Any guide/help to the right direction is appreciated.

The uploaded .oml file has an error "Input string was not in a correct format.".


Found this very helpful post:

This seems to be the answer I'm looking for. Feel free to post other ideas.