Folder for upload must be selected from GUI, which not allow write ANY accessible folder, as "on-external-sd"

### ⚠️ 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. put in Phone external SD card
2. try to select this from GUI
3. not possible

### Expected behaviour

Folder selected / or DIRECTLY entered manually ...

### Actual behaviour

not selectable - on choose "external" - that lead to the same Internal-emulated ...

### Android version

13

### Device brand and model

Any

### Stock or custom OS?

Stock

### Nextcloud android app version

Latest

### Nextcloud server version

no matter

### Using a reverse proxy?

No

### Android logs

_No response_

### Server error logs

```bash

```

### Additional information

_No response_