Check the connection to the Google Flow Chrome window: signed-in session, account, open project and credit balance. Call this first when something fails.

Generate one or more images with Google Flow and save them to disk. You can ask for an exact pixel size (e.g. 1200x630): it generates at the closest native aspect ratio and crops to the size you asked for. Images cost no credits.

Download an image that already exists in Flow by its media id, with optional cropping to an exact size.

List the images in the Flow project library: uploads (reusable via reference_library_names without re-uploading) and generated images (re-downloadable by id with download_image).

Generate several DIFFERENT prompts at once, one browser tab per prompt, in parallel. Much faster than calling generate_image repeatedly. Up to 4 jobs; each can have its own size and filename. Reference images are not supported here — use generate_image for that.