Hi,
I am not a web developer, but I believe it is pretty much the default of web browser to not allow web pages to write to disk without user action....
That said, and on a very selfish note (sorry about that), I was wondering if you would mind sharing how you manage to feed into an editable DT table data coming from an uploaded file. Do you implement server-side or client-side editing? I am trying to implement server-side editing based upon a data.frame that is contained in a reactive object, but I am stuck with the inability to set a reactiveValues content using a reactive object (see this other thread).
Thanks