Resource group

Yanping Sun, in addition to the information provided by TP above, the following should help add more insights around cloud shell.

1. The resource group name, as you have mentioned in the question, is the standard naming convention for resource groups (RG) which gets created when you use Azure Cloud Shell. It does not require a new cloud shell account, but an azure storage account is required which gets created in this resource group.
2. Although this RG might have been created on its own when you used Cloud shell, you are not blocked from creating a custom RG with this name. A quick way to check if this RG is related to cloud shell is to examine what is in it. If it was related to Azure Cloud Shell, you would see it contain a storage account like below (there might be other resources in it too, if you have selected this RG for storing them):

1. You may open this storage account (by clicking it), and use "Storage browser" to see what is in this storage account. Again, you may use this storage account for your other applications/services too, however, if this was only created for cloud shell, you would only see a fileshare with name similar to "cloudshellfs" or something like that. This file share would only have a single folder with the name ".cloudconsole".
2. If point 3 is the scenario in your case, you can use this storage account again when requesting cloud shell. The cloud shell can be launched using the "Cloud shell" global control placed at top right corner of Azure Portal as shown below:

1. Or you could use the URL mentioned "shell.azure.com".
2. Depending on how your last session was closed, you might be prompted with a window like below:

1. This states that the storage is not mounted. There still might be storage accounts which can be used. You may at this point choose to create a new storage account again, using the "Create Storage" button. OR, you could click on "Advanced settings" option and mount an existing storage account which has cloud shell file share. Ensure that the "Cloud shell region" is the same as the storage account that you want to mount. Use the "Use existing option" to mount an existing fileshare here:

Hope this helps.

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