Not able to set up Dynamic Data Attachments

Hi guys!

I’m trying to set up a Dynamic Data Attachment between two survey (I am the owner of both). I followed the instructions: Dynamic Data Attachments — KoboToolbox documentation
but something seems not work…

Can you please check my parent and child survey (Attached) and help me to figure out what’s wrong?
Thanks in advance for any help…
Chiara

Parent.xlsx (7.2 KB)
Child.xlsx (8.3 KB)

Welcome back to the community, @chiaramarioni! Maybe you will need to use the exact same XLSForm that was used in the support article to learn how the dynamic data attachment feature works.