How to reproduce:
1. Download and open the attached project
2. Build and deploy the project to iOS 13 or lower
3. Press the "Register Local Notification" button
Expected outcome: No errors appear in the Xcode console
Actual outcome: "Exception: Invalid attachment file URL
at Unity.Notifications.iOS.iOSNotificationsWrapper.CsAttachmentsToObjc" error appears
Reproducible with: 2021.3.33f1, 2022.3.16f1, 2023.2.3f1, 2023.3.0a19
Reproduced on: iPhone 6S (13.3.1)
Could not reproduce with: iPhone 13 Pro (iOS 16.6.1), iPhone 12 Pro (iOS 14.2.1)