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It seems that the files uploaded are not encrypted as the data received on other input fields. You'll be prompted to upload the key in order to view the submissions.
Please note that the submissions cannot be viewed from your account unless the right-key is uploaded.
Let me forward the issue to our back-end team if this can be implemented. I cannot guarantee that the feature will be implemented or any time frame at the moment for implement. However, you'll be posted through this thread once we have any update on this.