No Way to Identify Unsyncable Files With Invalid Filenames

### ⚠️ Before posting ⚠️

- [X] This is a **bug**, not a question or an enhancement.
- [X] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [X] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

1. Synchronize a remote folder which contains files with "invalid" filename (whatever this may mean - due to this bug I currently cannot find out. ;) As all files were uploaded from Linux and are now downloaded to an Android device's internal flash storage, I'd have expected all filenames to be compatible.)

### Expected behaviour

In case a file with an "invalid" filename is encountered, the error notification should indicate which file was affected, so the user has a way to identify and adjust the offending file(name).

(The most convenient solution would probably be to transparently "adjust" the filename and continue successfully, but that's a [different issue](https://github.com/nextcloud/android/issues/11241) is not directly related to this issue here.)

### Actual behaviour

An error notification is generated which only says "Invalid filename for local file" but does not provide any information regarding **which** file was actually affected, and why the filename was "invalid".

See screenshot.


I ended up with a dozend or so of these notifications - how am I supposed to fix this?

### Android version

13

### Device brand and model

FairPhone 5

### Stock or custom OS?

Stock

### Nextcloud android app version

3.25

### Nextcloud server version

27.1.3

### Using a reverse proxy?

Yes

### Android logs

_No response_

### Server error logs

```bash
No server issue.
```

### Additional information

I don't have Android development tools installed and no dev mode active, so cannot easily access the client's logs.

Why don't you make these accessible in the GUI directly?