Pre existing App stability and maintenance

Description

We use our app to upload property reports with pictures in them to a web based dashboard. Very occasionally these reports go missing and leave the mobile device but do not arrive on the web-based dashbboard. We need a safety net between the app and the dashboard so reports can't go missing.
We've been advised also there is a lack of error handling within the application for API calls we've been advised to add analytics to the existing app to give visibility of what users are doing, how they're using the app and where things are going wrong.
Can you advise on if you can do this and costs. We are also looking for a price for ongoing maintenance if you can proovide this please. In the future we are also looking to ddevelop the app.
Here is the link to the code to review: https://www.dropbox.com/scl/fo/zwq9piv4lwxjftxi4goou/AH-S2SXOxqrtVtsbdzy_ptY?rlkey=k1k4epgo4p18ruj5du5lc5bao&dl=0