src/Helpers/Thumbnail.php
public function exists($filename)
    {
        return $this->file->storage->exists($this->file->path($filename));
    }
public function exists($filename)
    {
        return $this->file->storage->exists($this->file->path($filename));
    }
public function exists ( $ filename ) { return $ this -> file -> storage -> exists ( $ this -> file -> path ( $ filename ) ) ; }
Check if thumbnail with given name exists.

@param  string $filename
@return boolean
Check if thumbnail with given name exists .