Data Transfers · Downloads and large files
Where is a downloaded file saved and what is it called?
Short answer: In the Save to folder you chose (Downloads by default), named after the last part of the link. A large download's pieces are kept elsewhere until it's complete and checked, so no half-finished file appears in the folder.
It's saved in the Save to folder you chose — your Downloads folder unless you changed it. The file is named after the last part of the link; when you paste the link, the sheet shows the name it will use in "Download link recognised — … will be saved into the destination folder".
While a large download is still in progress, its pieces are kept in Storage Studio's own working area, not in your destination folder, so you won't see a half-finished file there. It appears once it's complete and checked.
Related: Download a file from a link