Combining Form Results: Audio link not being transferred to the spreadsheet

I tried to use the app for combining forms.

It works well for some forms but for the form where there is an audio submission, it would not add the field to the combined spreadsheet.

Would you please let me know what is the correct way to do this so the wav file of the submitted audio will be transferred to the combined worksheet.

Much appreciated. Thank you.

I tested and if you are using an upload field for the audio file, this field will show in the combine submissions app and in the Spreadsheet. 

If you are using the voice recorder widget, it will also be available in the combine submissions app CSV file:

Please let us know the forms' urls so we can make further tests.