How do you copy the file name of the currently opened file in sublime text 3 ? If this is not possible by default, perhaps you know some sublime extension which does that job using keyboard shortcut.
You can do this if you have the SideBarEnhancements plugin installed.
Open up the command palette with Ctrl+Shift+P (on Mac it is ⌘+Shift+P)
Type File: Copy Name
and press Enter
The file name has now been copied to your clipboard.
Setting a hotkey for this command:
Go to your Key Bindings -> User file
Add this line to your file: { "keys": ["ctrl+shift+l"], "command": "side_bar_copy_name" }
Change "ctrl+shift+l"
to whatever command you want to use.