Hey there,

Have you recheck your configuration for the Google Drive File Upload in Form Builder :  Google Drive Storage Integration#:~:text=Figure%201%3A%20Google%20Drive%20File%20Upload%20in%20Form%20Builder

Ensure that you define the correct Google Apps account for file storage. Its best if you use the same account for your API configuration. 

Cheers!

I put here the id given by google cloud when I configured the API (xxxxxx@bhjg-crm.iam.gserviceaccount.com)

If I put the normal email of my account it gives an error (unknown error). but with this account, it works fine but does not put the files in my account's drive.

I found the problem. What I was missing is the user delegation. I have created the service and enabled the Google Drive, but did not add any user delegation. So the service was adding the files to the service account and not the user account (which is in this case do not exist). After adding the delegation I could add the user account in the form element property and hence the files were uploaded to the designated folder.