How do I add tracking number for returned when item not sent using ebay postage label?

I purchased an item but decided to send it back under the 14 day money back offer as I just didn't like it.

 

The returns postage costs for the ebay return labels are more as expensive as using Royal Mail signed for large letter so i have sent it back using my own postage

But If i view the returns details I don't get any option where I can upload my own Royal Mail tracking number to the return. I only get the option of buying a Royal Mail label for £3.25 or Collectplus for £4.60 so as far as ebay are concerned I haven't sent back the item yet because I haven't purchased their own returns label (which I am sure they probably making some profit on everyone that purchased)

 

Can anyone tell me how to mark this return as sent and upload the tracking without using the ebay returns label?

 

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Sorry but as far as I know the idea is that you use the Ebay label which is loaded on ebay when scanned at the Post Office. Seller might refund on receipt, but as you have gone outside the system, did you open a Return Case, then without proof of delivery for ebay to see then you have no means of enforcing a refund. Saving pennies could end up losing you £s.