The easiest solution would be to simply move the files to another computer by using a cable or sending the files. This might be difficult as documents in the PDF-Expert folder – in contrast to the folders with pictures, films, etc. - are only rarely approachable when opening the IPad media on a Linux or Windows system.
Thus, the only solution always working for me seemed to be uploading the files (or an zipped archive) to a web-space (e.g. home.student.tuwien.ac.at or a dropbox) and downloading them (it) from another computer where the TUWEL system can be used easily.