I have this shiny app deployed on an internal server on which Shiny Server Open Source is installed. The app includes a fileInput component to upload a file. Some remote users connecting to our network through a VPN reported having issues uploading large files: the upload progress bar would increase slowly, ultimately turn red and report "Not found". The same files would upload just fine when they are upload from the user computers rather than from a remote drive. Similarly, users working within the network (ie users who do not require a connection through VPN) would not experience any upload issues.
Overall, it looks like the fileInput component simply "time out" for our remote users uploading large files. Is there a way to increase the threshold for time out?