Cannot update application credential for Microsoft Copilot Studio

Question

Hi,

I receive a recommendation email from Azure that the application credential will be expired and I need to update the credential. The applications are:

• Z Copilot - Sharepoint (Microsoft Copilot Studio)
• Conversational action 1 (Microsoft Copilot Studio)

Seems they are default application for Microsoft Copilot Studio. After clicking the update credential button, it redirects to admin portal (Certificates & secrets). It have 4 certificates and 1 of them will be expired. However, I only can see "upload" button which I need to upload a .cer file.

My login account is global admin and also security admin already. How can I update the application credential for these applications?