Usage:
  Upload: python upload.py <file_path>
  Download: python upload.py download <url> <save_path>

--- Running Self Test ---
Uploading img_1_gen.png to aigc-crawler/crawler/image...
Upload SDK Response: {'oss_object_key': 'crawler/image/img_1_gen.png', 'save_oss_timestamp': 1775658352873}

Extracted URL: https://res.cybertogether.net/crawler/image/img_1_gen.png
Downloading from https://res.cybertogether.net/crawler/image/img_1_gen.png to downloaded_dummy.png...