It not possible to re-upload a file with the same name and location

[ayanamartins]

If the user changes the content of the input file, it is not possible to re-upload it if the name or location of the file is not changed.

[andrechalom]

The bug is caused by the shiny fileInput control, so I don't think we can solve it without writing a replacement UI element for it. There is an easy workaround for it, however: the user can select any other file, then change back to the original file to upload it again.

This Stack Overflow post details some of the underlying problem:
http://stackoverflow.com/questions/17352086/how-can-i-update-a-shiny-fileinput-object

[piklprado]

I mentioned this bug in #48 but it is not a priority for the 2016 Field Course.

[andrechalom]

Tested on Firefox 46 on Windows 8 and I'm able to re-upload a file with the same name.

This is now a bug that only happens on Chrome.