I think I found why it's not working for me. All files I tried to send were in some folders in MyDocs. So, if file is in /home/user/MyDocs (root of MyDocs) - i can send it. But if it is in, for example, /home/user/MyDocs/some_folder (subfolder of MyDocs) - it's not working. Probably it has something to do with tracker.