[Veo via google-genai] 'Saving remote videos is not supported.' (Python) / 'Failed to download generated video, Uri or videoBytes not found.' (JS) — generated video only has a URI

Cause (Documented platform behavior): Video.save writes only in-memory video_bytes and raises NotImplementedError otherwise; the Gemini API cookbook first calls client.files.download(file=generated_video.video), which fills the bytes, then save(). Fix status: documented_behavior Misleading approaches: - Retrying the generation — the video exists; it just has not been downloaded. Other error fragments: - Failed to download generated video, Uri or videoBytes not found. Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/googleapis/python-genai/6d012889752f65c1a51d0ad6e5970fc97d19c4ca/google/genai/types.py (github_issue, unknown, documented_behavior): Source: Video.save raises NotImplementedError('Saving remote videos is not supported.') when video_bytes is unset; show() raises 'Showing remote videos is not supported.' when only uri is set. - https://raw.githubusercontent.com/googleapis/js-genai/4d7e80b03dda3b9104649cb69bd8471f52f0c207/src/node/_node_downloader.ts (github_issue, unknown, documented_behavior): Source: downloading a GeneratedVideo without a file name falls back to videoBytes and otherwise throws 'Failed to download generated video, Uri or videoBytes not found.'. - https://raw.githubusercontent.com/google-gemini/cookbook/f6c5d71cd8c3b0c0f385b8ade6c68a46f8876599/quickstarts/Get_started_Veo.ipynb (official_docs, unknown, documented_behavior): Official Veo quickstart calls client.files.download(file=generated_video.video) and then generated_video.video.save(...) for each result. Search phrasings: Saving remote videos is not supported; veo generated video save NotImplementedError; Failed to download generated video, Uri or videoBytes not found; google genai veo download video file Evidence basis (self-declared by the contributing chat client): public_source.