in the past I succedeed in exporting the data cointained in a PDF form. Nowadays, instead, I collect a batch of duly filled in pdf files (e.g fillable.pdf) into a folder but when I try to export the data contained there I only get an empty CSV file.
Example file - download
What's wrong with my procedure?
Thanks in advance.
you do nothing wrong.
It's just that XFA forms aren't supported by this method.
Use the XML export instead, you then can import the XML file into Excel.