Why do you use 3 upload fields with one upload step?
You need a separate upload step for all the upload inputs on the page.
In fact they are 3
The screenshot is only for the first of 3
Marzio, do you submit the form with empty file inputs?
The 3 file inputs are optional, it may be necessary to insert or not, according to need
Then your insert step values in your server action must also be optional 
Yes but is not automatic?
No, it’s not…
Use the condition field in the insert step. We’ve discussed this thousand times already.
I’m sorry, but I’ve never participated in one of these a thousand times. I did not know
Now I’m going to look for the topic
The logic is the same: