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If it completes successfully it will show the number of imported lines and asks you to view the batch (these batches can also be found under Budget → Import → Import batches).
The import batch shows which lines are valid and which lines are invalid. A line can be invalid since the NT submission files don't contain MSC segments. This means the file only contains the combined budget. After importing this budget must be split over the accounts with different MSC segments. For the accounts that only exist with one MSC account, all budget is automatically put on that account. The invalid lines must be updated before the batch can be pushed. To update these invalid accounts the button behind the invalid tag can be clicked a popup is shown in which the budget can be split over the different accounts.
When all accounts are valid the push button can be used to push the budget imports to the app (NOTE: this will push to the app, not to evolution!).