Collabora export pdf not working with spaces in filename

Describe the bug
With Nextcloud running as a snap on Ubuntu and with Nextcloud Office enabled with the CODE server, it is not possible to export a document to pdf format.

To Reproduce
Steps to reproduce the behavior:

1. Go to Files/Documents in Nextcloud web interface
2. Click on '(+)/New document' and accept the default name (New document.odt)
3. Add some text
4. Click on 'File/Export As/PDF Document' and accept the default name (New document.pdf)
5. Click 'Export' to accept the PDF Options
6. Click on 'X' to close the document
7. Refresh the Documents folder - no new pdf document appears!

Expected behavior

1. Repeat the steps above, but change the document name to 'New_document.odt', or something else without any spaces
2. After clicking 'Export' in step 5 above, a dialog box appears with 'Exported to Storage / Successfully exported: New_document.pdf'

Note that changing the name of the exported document doesn't seem to make any difference.

Screenshots

Client details:

• OS: Nixos 23.05
• Browser Firefox 116.03
• Device: Lenovo laptop

Server details

Operating system: Ubuntu 22.04

**Web server: See Nextcloud snap version 27.0.2snap1

**Database: See Nextcloud snap version 27.0.2snap1

**PHP version: See Nextcloud snap version 27.0.2snap1

**Nextcloud version: 27.02

**Version of the richdocuments app: Nextcloud Office 8.2.0

**Version of Collabora Online: CODE 23.5.301

#### Browser log

</details>

Start by reproducing the export flow in the Nextcloud web interface with the default “New document.odt” name and Collabora CODE enabled, then compare it with a filename without spaces. Trace the export-to-storage path and its interaction with Nextcloud Office; done means a PDF is created and the success dialog appears for filenames containing spaces.