Hi sebastian,
As far as i know, there is no caching associated with this process of downloading your documents.
First time you see only list of documents, so it can read what is there as content inside so does show as blank, but once its downloaded it shows the preview of the content, which helps in easy identification based on content.
There are no caching servers related to your mobile, so i see very less of chance of caching available at this point with mobile.
Thanks
Mallik