====== uploadRawData() ======

''string **uploadRawData**(string //variable//)''

The function ''uploadRawData()'' opens a file uploaded by the respondent and returns its content as a binary string.

  * //variable//\\ The ID of the variable that belongs to the upload, or the ID of the upload question.


===== Return Value =====

If the file cannot be opened, the function returns ''null''.

Otherwise, a string with the content of the file is returned.