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This is intended. The ta_partner bucket does not allow read operations. The TON Upload script was designed to be bucket agnostic. You will not be able to verify the upload.
That being said, the upload does check whether the number of bytes were received that you indicated on the initial POST call. We have no history of upload corruption, even for uploads of multiple GBs.
If you get a 201 Created response everything is good to go.
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This is also intentional. While parts of our API works in Sandbox, the required processing infrastructure for Tailored Audiences does not exist in Sandbox.
We recommend you use a separate test account (handle / ads account) in the production environment.