I've been trying to develop a Blazor WebAssembly app (I'm trying with both .NET Standard 2.1 and .NET 5.0) and my goal is to allow the user to select a file using `InputFile`and for that file to be uploaded to an Azure Blob Storage Container. I've been looking around a lot and following different guides here and there but with no success. The issues I was obtaining were usually related to security for example CORS (Although it had been fully set up), Authorization fails and System.PlatformNotSupportedException: System.Security.Cryptography.Algorithms is not supported on this platform.

Regardless of whether it is good practice or not; is it possible to directly upload to a blob storage from a blazor app? One method i tried was via a **SAS** token. It works via a CONSOLE APP but not a BLAZOR APP.

```
<label for="browseData"><b>Browse File</b></label>
<p><InputFile id="browseData" OnChange="@OnInputFileChange" /></p>

private async Task OnInputFileChange(InputFileChangeEventArgs e)
{
    var maxAllowedFiles = 1;

    var inputFile = e.GetMultipleFiles(maxAllowedFiles).First();

    var stream = inputFile.OpenReadStream();

    await StorageService.UploadFileToStorage(stream, "sftp-server", inputFile.Name);
}

```

**Storage Service**

```
public class AzureStorageService

{
    private readonly IAzureStorageKeyService _azureStorageKeyService;

    public AzureStorageService(IAzureStorageKeyService azureStorageKeyService)
    {
        _azureStorageKeyService = azureStorageKeyService;
    }

    public async Task<Uri> UploadFileToStorage(Stream stream, string container, string fileName)
    {
        try
        {
            const string REPLACE_THIS_ACCOUNT = "test";

            var blobUri = new Uri("https://"
                                  + REPLACE_THIS_ACCOUNT +
                                  ".blob.core.windows.net/" +
                                  container + "/" + fileName);
            // Create the blob client.

            AzureSasCredential azureSasCredential = new AzureSasCredential(
                "?sv=2019-12-12&ss=bfqt&srt=sco&sp=rwdlacupx&se=2021-01-20T04:21:45Z&st=2021-01-19T20:21:45Z&spr=https&sig=OIkLePYDcF2AChtYUKs0VxUajs4KmwSyOXpQkFLvN2M%3D");

            var blobClient = new BlobClient(blobUri, azureSasCredential);

            // Upload the file
            var response = await blobClient.UploadAsync(stream, true);

            return blobUri;
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
            return null;
        }

    }
}

```

Like I was mentioning this will work via a console app but not a blazor app due to CORS..is this a security feature that just cannot be bypassed and just has to be done via the server side through a function -> blob?