PositLog does not suggest any method to upload all files together by the graphical user interface; however, you can upload files by FTP and easily gain access to them from Rich Editor.

Every page has its own upload directory. 

- Image files

  $datapath/PageID/Image/

- Other files

 $datapath/PageID/File/

Use Resources Browser to import files to a sprite. The Resource Browser can be opened form the dialog, which is opened by clicking on the "Insert/Edit Image" or "Insert/Edit File" button on Rich Editor.