There is an encoding issue when downloading certain files.
I have mentioned more details, and a possible workaround for this here: Read text in .txt file stored in google drive - #4 by samliew
You can try using a “Convert encoding” module using the same input and output encoding, then you can use the output of this module in a subsequent module (like Parse CSV or JSON).
Alternatively, you can simply try using the toString built-in function in the mapped field, something like this: toString(data) – however this method doesn’t work in some cases where the encoding actually has to be converted.