Microsoft Azure Storage Explorer recently updated to version 1.13.0 and updated AzCopy to 10.4.2. With this update, a bug was introduced inadvertently with a change within the client SDK for Azure. Essentially, when copying a file, instead of:

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https://(storage account).blob.core.windows.net/(container)/folder/file.doc

You’ll now see and / after the container decoded as %2F instead:

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https://(storage account).blob.core.windows.net/(container)/folder%2Ffile.doc

Navigating that URL will not resolve properly. Microsoft is aware of this issue and is working on a resolution. In the meantime, replace the %2F values with / so the file will load properly.

https://cdn.jasongaylord.com/images/2020/05/16/microsoft-azure-storage-explorer.jpg