PPTM files aren't imported/shown properly

Preconditions: LibreOffice Server must be configured and started.

1. Create a new page and select "Page From Office" from Type box
2. Browse for .pptm Office document
3. Click Import
4. Click on the result link

Expected result: The document imported is properly displayed inside a Wiki page.

Actual result: The full document isn't shown properly, only the first page can be seen.

Clicking on "Continue" and "Last page" leads to img1.html
"Text" leads to text0.html