If it's not ticked then it shouldn't happen. Double-check your Tools>Options>Saving to make sure it's not listed. If you see a file that's incomplete & being uploaded, then it could be a bug or you already downlded a similar file. Check your recently downlded files:

Go to your LW Library window, select Saved Files folder & press the Explore button. Sample image here: Using Library Explore button to access downld folder (click on link) & see if the same file is listed there. In the newer versions, it offers the option of sharing newly downlded files!!! So be aware of that! That can also be changed in options.