Popular Questions

Last updated: 2025-12-17 15:53:45

Billing and Metering Issues
How is COS billed?
How is the cost of COS traffic calculated?
How is COS egress traffic of the public network generated? How is it billed?
Is there a free tier for COS?
Why do I still incur charges even when enjoying the free tier?
How to purchase COS resource packages?
Why do I still incur charges even after purchasing resource packages?
How to renew COS resource packages? Why can't some be renewed?
Are resource packages refundable?﻿
How to avoid and handle COS overdue payments?
For more questions, see Billing Issues.
Domain and CDN Issues
How to configure a custom domain for COS?
For more questions, see Domain and CDN Issues.
Issues with File Operations
How to upload objects to COS?
What to do if uploaded files are inaccessible in COS?
How to preview COS files directly in the browser?
How to download objects from COS?
For more questions, see issues with file operations.
Issues with Permission Management
How to handle COS exceptions in resource access?
How to set access permissions for a COS bucket?
For more questions, see Issues with Permission Management.
API/SDK Related Issues
How to use the API to upload local objects to a specified bucket?
How to install and use the JavaScript SDK?
For more questions, see API Issues and SDK FAQs.
Other Issues
How to activate COS?
How to disable COS?
How to use the self-diagnosis tool for COS?
How to view the COS error code list?
How to unblock COS after it has been blocked?
For more questions, see General Issues.

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Billing and Metering Issues

Domain and CDN Issues

Issues with File Operations

Issues with Permission Management

API/SDK Related Issues

Other Issues