Fill & sign is a tool that help you to fill the PDF form and add signature in it.
Could you please let us know where you have saved the files and the Adobe application you are using.
If you have deleted the files, you will not be able to retrieve them.
All our PDF files that are filled out are exported to out iCloud drive on our iPads. Unfortunately, we had one person delete some files before he could export. Which is why I wanted to know if they could retrieved.