fileInput crashes in Shiny app with large file

My Shiny app runs on an AWS EC2 server. Users upload datasets using the fileInput function in Shiny. One user (in Switzerland) routinely finds that the application hangs up after selecting her files (totalling 1GB) with the fileInput function. The fileInput progress bar shows some progress and never completes; the application never responds. Are there any strategies for uploading large datasets (over long distances) in Shiny apps? By the way, I have set options(shiny.maxRequestSize = 3*1024^3).

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