See explanation below.
Explanation
Azure portal create public container
To create a container in the Azure portal, follow these steps:
Step 1. Navigate to your new storage account in the Azure portal.
Step 2. In the left menu for the storage account, scroll to the lob service section, then select Blobs.
Select the + Container button.
Type a name for your new container: bios
Set the level of public access to the container: Select anonymous access.

Step 3. Select OK to create the container.
References:
https://docs.microsoft.com/en-us/azure/storage/blobs/storage-quickstart-blobs-portal