During the first 24 hours after uploading the work it remains in pre-registration, a period during which it is possible to edit it to perform any change, including the same file.

If you want to include in the registered work the registration label:
1 .- Make the standard registration of the work.
2 .- Once registered, in the listing of works ("My work"), select the icon that appears at the right of the work named "Get Labels".
3 .- Choose the label you feel is most appropriate.
4 .- Paste the label on the part of the work that you think is more appropriate.
5 .- Before the end of the 24 hours pre-registration period, edit the entry and replace the uploaded file with the the one that now does have the label in it.