what is the spreading at the end of the upload???

During the spreading, additional redundant file fragments are uploaded to ensure the availability of the file. In the early alpha, this didn't take long since there weren't many computers available to upload fragments to. With the increased size of the Wuala network this begins to take a little longer. To address this, the next update separates the upload from the spreading phase. As a result, we can prioritize uploads over spreading, so spreading of files is postponed until there is no other upload left. Furthermore, others will be able to download the uploaded files before spreading is complete.