Unable to save all selected row objects from multiple pages while using SAIL

You can not select rows from multiple pages in the grid. It's per page since when you define gridSelection and you define pagingInfo in the gridSelection. To solve your problem, you can have Add button under grid and when user clicks on add the selected rows get stored into local variable lets call it as local!selectedData. When user goes to next page in grid and select some rows then again clicks on Add for which you will have to use append(local!selectedData, index(local!gridDatasubset, local!gridSelection.selected, null)) in saveInto of Add button and you can show that data in another grid. And that's how you will have all the selected rows data in local!selectedData. Let me know if that makes sense.

You can not select rows from multiple pages in the grid. It's per page since when you define gridSelection and you define pagingInfo in the gridSelection. To solve your problem, you can have Add button under grid and when user clicks on add the selected rows get stored into local variable lets call it as local!selectedData. When user goes to next page in grid and select some rows then again clicks on Add for which you will have to use append(local!selectedData, index(local!gridDatasubset, local!gridSelection.selected, null)) in saveInto of Add button and you can show that data in another grid. And that's how you will have all the selected rows data in local!selectedData. Let me know if that makes sense.