when i need to update a field (or a few fields) i use the update item, but when the workflow runs it updates all the list, any solution for that? because it's annoying when i have a lot of fields and must fill all to avoid the update to blank.
Can you post a screen shot of your Flow in edit mode - that will make it much easier to assist.
The way I've gotten around this in the past is to add the campo3 dynamic content into that blank. That way during the update it will update it to the value that was already there.
Does that make sense?