Nexonia can send email notifications to an author (a Nexonia user who created the entry/item), when a submitted item/entry is edited by the approver.
You can enable notifications in Nexonia by taking the following steps:
Navigate to Settings > Users > Approval and then click on the name of the Approval Process (e.g. Expense Approval Process). Then, click on Edit.
Select the approval step (to which this notification would be enabled) by clicking on the name of the step. It exposes the settings for this step. Scroll down to the Editable section and check the box beside 'Notify on Edit'.
Click on Apply from the bottom to save the change.