Google Drive uc?id= URLs can serve HTML interstitials instead of file content

The commonly used https://drive.google.com/uc?id={file_id} URL pattern can return an HTML interstitial page instead of the raw file, particularly in enterprise/Workspace environments with external sharing restrictions. The Drive API's webContentLink field (returned when requested via fields parameter) provides a more reliable direct download URL. When webContentLink is unavailable, appending &export=download to the fallback URL improves reliability.

Request webContentLink in the Drive upload fields parameter and prefer it over constructed URLs. Use &export=download in any fallback URL.