How to change ‘Maximum upload size exceeded’ restriction in Shiny and save user file inputs?

Quoting Joe Cheng from this shiny-discuss post

By default, Shiny limits file uploads to 5MB per file. You can modify this limit by using the shiny.maxRequestSize option. For example, adding options(shiny.maxRequestSize=30*1024^2) to the top of server.R would increase the limit to 30MB.