PDF file preview

### ⚠️ 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

Just try to view a PDF document uploaded to the cloud. The viewer tries to open it but can't.

### Expected behaviour

When you try to open or view the PDF file, it should open for viewing.

### Actual behaviour

When you try to open the PDF file, it opens broken or not playing the contents.

### Android version

Android 16

### Device brand and model

Xiaomi Poco X6

### Stock or custom OS?

Stock

### Nextcloud android app version

34

### Nextcloud server version

29

### Using a reverse proxy?

No

### Android logs

_No response_

### Server error logs

```bash

```

### Additional information

_No response_

No source file, test, or entry point is identified in the report. First reproduce PDF viewing on the stated Android 16, Xiaomi Poco X6, Nextcloud Android 34 and server 29 setup, then trace the viewer failure and collect relevant logs. Done means PDFs open and display their contents correctly.

Written by the indexing model from the issue text.