In step 1, when pressing "next", a system error as following appears:
The specified file temporary://<myFile>[_<sequenceNumber>].csv could not be moved, because the destination is invalid. More information is available in the system log.
- Error moving file
<myFile> ::= any valid CSV file (examples I tried were correctly processed before).
<sequenceNumber> ::= a number from 0, indicating the upload atempt from the same <myFile>.csv file