When data is located on Oneprovider different than we use to browse the space, then download procedure after file double-click gets a huge delay, because data must be transferred to the "gui" provider at the beginning. When first data blocks are transferred, then download starts as usual. Task: add spinner to some GUI element to indicate that download is being processed. Probably backend response for download token will block until first data blocks are transferred to the downlad provider (ask BW and ŁO for more info).