Upload File with Progress from Browser to Azure Blob Storage

Recently I am working on an internal OA system for a small company. One of their business requirement is for the users to upload attachments when creating a ticket. Azure Blob Storage is ideal for this scenario. However, the attachments are sized from a few KB to hundreds of MB, so it is necessary to show a progress bar when user upload the files. Let's see how can we easily do it with Azure. …