ExMicrosoftAzureStorage.Storage.Blob.put_block_list

You're seeing just the function put_block_list, go back to ExMicrosoftAzureStorage.Storage.Blob module for more information.
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put_block_list(blob, block_list, headers \\ [])

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The put_block_list operation writes a blob by specifying the list of block IDs that make up the blob.