Question: What is the final step when using the Package uploader?
- Click "Validate"? button.
- Upload metadata files through UI.
- Drag and drop media files.
- Process the package.
Explanation
The final step in the Package uploader workflow is to submit the validated upload batch for processing. After metadata validation and required media files are added, YouTube needs the package to be processed before the delivery is completed. This step starts YouTube’s bulk upload handling for the files and metadata in the package. Processing status and errors can then be reviewed in Content updates.
Why the other options are incorrect
Validate button is incorrect because validation happens before final submission.
Metadata files is incorrect because metadata must be added before the package can be completed.
Media files is incorrect because dragging and dropping files is an earlier upload step.
Source for verification
https://support.google.com/youtube/answer/3077589
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