This document is not yet written. Terms of service for a platform that takes custody of customer assets must be drafted by a qualified lawyer — they govern title transfer, insolvency treatment, dispute resolution, limitation of liability, and the regulatory basis on which the business operates. Publishing placeholder text here would be worse than publishing nothing.
In the meantime, the custody charter describes how the platform actually handles your metal, and the disclosures page describes what is and is not live.
Questions about a specific transaction can go to the support desk.