Use of Item Index and Item Offset

Automation Studio Web Automation
1

Hi Team,

I see the option of Item Index and Item Offset whenever I select any action of Web Application automation.

Whenever I change the value of Item Index / Item Offset my action doesn’t work

When should I change the values of Item Index and Item Offset?

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2

Item Index is the index number of selected items that is on Web, while extraction it provides index of an item, other fields like item offset are auto populated based on item index.