I have the preview app installed and everything runs fine execpt on Android: it won’t display the preview of ODT, TXT, MP3 and PDF files.
What’s going wrong there?
Screenshot of browser:
Screenshot of Android:
@Sanook everything is fine here 
The reason for this is that the Android client only supports previews for images at the moment since the preview images are fetched from the server. So for any other file type we simply show the file type icon. So you could simply call this a missing feature but I don’t know if the server supports fetching preview images for the mentioned file types as a server api that could be used by the client.