In my understanding, SSL certificate accommodation is not supported on storage account access. There is a user voice entry here and still open for some years on the same topic.
The alternate way of using SSL is to Integrate an Azure Storage account with Azure CDN and use SSL along with it.
You can have a custom domain and use the third-party SSL certificate on this approach.
More details are here: Map a custom domain with HTTPS enabled
Integrate an Azure Storage account with Azure CDN
Configure HTTPS on an Azure CDN custom domain
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