You need to have a support ticket in order to attach files to it using the Transfer site. I checked to see if you have any support tickets, and I noticed you created a ticket via the Customer Advocates team.
In your example, you're using ABC-12345. This is invalid. You need to use a valid ticket number that you have logged in our support system that is associated with your email address.
Can you please try that and let me know how it goes?
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