fix: channel cover picture upload

[sasicodes]

Description

Closes #(issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Minor changes in old functionality

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• My changes generate no new warnings

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Name	Status	Preview	Comments	Updated
embed	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Dec 28, 2022 at 1:03PM (UTC)
web	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Dec 28, 2022 at 1:03PM (UTC)

1 Ignored Deployment

Name	Status	Preview	Comments	Updated
api	⬜️ Ignored (Inspect)			Dec 28, 2022 at 1:03PM (UTC)