How can I add an identification number to my form

Hi @analucia_espinoza,

Try this out as outlined below:

In the survey tab of your xlsform:
Image 0.1

In the settings tab of your xlsform:
Image 0.2

If you fill out the same in KoBoCollect android app, you should be able to see the file name as follows:

If you fill out the same in Enketo, you should be able to see the file name as follows:

Finally, upon submitting your collected data to KoBoToolbox server, you should be able to see the file name as shown in the image below (please note this image is the data sent from data collected through Enketo)

Reference xlsform:
instance_name (Unique ID).xlsx (10.9 KB)

Have a great day!