The uploaded file must be a text file composed of two colomns :
first colomn contains the command,
the second is the response.
Numbers must be integers, colomns separators can be any character except 'Enter' (ASCII codes 10 or 13) and numbers (ASCII codes from 48 to 58). Each line ends with 'Enter' (ASCII code 10 or 13). An example of valid file can be downloaded here.