Attaching a screenshot results in error with Samsung phones

Sometimes when using a Samsung phone, the app returns an error when attaching a screenshot as a photo. This appears to be a specific issue with the way Samsung's flavor of Android handles the naming of screenshots by adding the name of the app in the screenshot as a prefix to the photo. If the name of the app contains any spaces, the photo will fail to save to the app.

To reproduce the issue:

1. Add a Survey point.
2. Choose to add a photo from gallery.
3. Switch to another app to make a screenshot.
4. Make the screenshot.
5. Switch back to Mergin Maps app.
6. Select the screenshot which you just made.
7. Try to save.

Adding a screenshot of 'Chrome' browser (works):

Adding a screenshot of 'Play Store' (fails):

In the diagnostic log, I see this when the photo attachment fails:

2025-10-15T16:28:32.033Z AppState: "Application changed state to:" Qt::ApplicationInactive
2025-10-15T16:28:32.895Z AppState: "Application changed state to:" Qt::ApplicationSuspended
2025-10-15T16:28:35.230Z Select image: Failed to copy image file to /storage/emulated/0/Android/data/uk.co.lutraconsulting/files/projects/1_photos/Screenshot_20251015_172650_Google%20Play%20Store.jpg
2025-10-15T16:28:35.280Z AppState: "Application changed state to:" Qt::ApplicationActive
2025-10-15T16:28:35.285Z Image Loading: Could not load the image. It may be missing or invalid, the URL might be incorrect, or there may be no network connection: /storage/emulated/0/Android/data/uk.co.lutraconsulting/files/projects/1_photos//Screenshot_20251015_172650_Google%20Play%20Store.jpg

Device:
Samsung A53
Android (15.0)
Mergin Maps v2025.5.0

No source file or test is named. Start by tracing the Android photo-attachment flow using the reproduction steps and diagnostic log, then compare screenshots whose app names contain spaces with those that do not. Done means a Samsung screenshot such as “Google Play Store” saves and loads successfully as a photo.