Steam now has a screenshot-hosting feature, but I've been unable to break the habit of hitting F5 to take traditional TGA screenshots in Team Fortress 2, rather than the new hotkey F12 (the default) to take screenshots for uploading to Steam.
There are a couple of images I'd like to upload, but as they weren't taken using the new hotkey they don't appear in Screenshot Manager. Rather, they're in the old screenshots folder,
%ProgramFiles%\Steam\steamapps\[username]\team fortress 2\tf\screenshots, in the TGA format.
Is there a way I can import these screenshots to Screenshot Manager for upload to my Steam profile?