[PRMP-1357] Error handling for invalid files during add more files

[lillie-dae]

Overview

Jira ticket: PRMP-1357

Description

Context

Checklist

Tasks for all changes:

• 1. I have linked this PR to its Jira ticket.
• 2. I have run git pre-commits. (WIP)
• 3. I have added and/or updated relevant tests.
• 4. I have updated relevant documentation.
• 5. I have considered the cross-team impact (and have PR approval from both Core & Demographics if necessary).
• 6. I have successfully deployed this change to a sandbox and witnessed unit and e2e tests passing:
  • 6a. Deploy - Sandbox - workflow run - TBC
  • 6b. SANDBOX Full- Deploy feature branch to sandbox - workflow run - TBC

Additional tasks for UI changes (delete if not applicable):

• 1. I have run the UI Smoke Tests against the deployed sandbox and witnessed it passing:
  • 1a. SANDBOX - UI Smoke Test - workflow run - TBC
• 2. I have added evidence (to this PR) e.g. screenshots/gifs of all visual changes.

[github-actions]

Code security issues found

View full details here.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud