Using spreadsheet File node output to add expression in another node

[jan]

The data is not lost. It does only not get displayed there. The Expression Editor simply always just displays the data of the first item. When the node executes it uses the data of all items.

So if you for example plug that data into a Slack Node it would send multiple Slack messages. The first message would use exactly the data you can see in the Expression Editor. The other messages will then use the data of the other items.

You can an example for that here:

Looping http request node

The most time there should be no need for looping anything in n8n as the nodes normally execute once for every item they receive. So also the HTTP Request Node. If you give it 3 items it will make 3 requests. Here a simple example (you can simply copy and paste it in n8n)