Activity.Current is null in Azure function with BlobTrigger

I have an Azure function(V3) that uses BlobTrigger binding and written in C#.

In order to add custom properties in Application Insights RequestTelemetry for it using

        Activity.Current?.AddTag("TraceId", traceId);

I need to access the Activity.Current based on the suggestion from this Stackoverflow answer. However, it didn't work due to Activity.Current is NULL.

My package configuration looks like as follow:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <AzureFunctionsVersion>v3</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Azure.Storage.Blobs" Version="12.9.0" />
    <PackageReference Include="Microsoft.ApplicationInsights" Version="2.14.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="5.0.0-beta.2" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Logging.ApplicationInsights" Version="3.0.14" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.8" />
    <PackageReference Include="SixLabors.ImageSharp" Version="1.0.3" />
    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="5.0.1" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

And my function looks like as follow:

        [FunctionName("Create-Thumbnail")]
        public async Task CreateThumbnail([BlobTrigger("input/{name}",  Source = BlobTriggerSource.EventGrid, Connection = "AzureWebJobsStorage")] Stream image,
            IDictionary<string,string> metadata,
            string name,
            ILogger log,
            ExecutionContext context)
        {         
            Activity.Current?.AddTag("TraceId", traceId);
        }

I have been doing research for whole day but failed to find any solution. Does anyone know what could be the issue?