Function upload 

pub async fn upload(
    client: &DriveClient,
    opts: &UploadOptions,
    rules: &[FolderPermissionRule],
) -> UploadOutcome

Uploads opts.content as opts.name inside opts.parent_folder_id, gated by rules. See the module doc for why there is no separate upload-side size check here — the caller already did it.

Every real (non-dry-run) attempt is logged; a --dry-run preview never is, matching create/move’s existing precedent.