Write range and write cell not working in Uipath apps

Hi all,

I have created the workflow for addition of numbers from excel. In studio its executing successfully and writing back the values to excel using write cell.
If I add this workflow to UiPath apps, process is running and executing but the sum values not writing to excel sheet.
Write cell not working if we add the process to UiPath apps. How to write values to excel. Please help me.

Lakshmi MP