Despite changing the app icon within the settings of the app builder:
The icon in the side navigation remains generic:
Is there a way i can change the icon on the side navigation?
App icons on the Side-Navigation are generic
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Can you try to clear cache and cookies then try again? Also, try to use incognito browser to update your custom app icon via the App builder and see how it goes.
If the issue persist, please reach out to us by creating a ticket so we can further investigate.