I have a Blazor Server app, that’s acting as a Teams App. The problem is that I can’t read files uploaded through this component:

`<InputFile class="form-control mb-4" OnChange="@OnInputFileChange" multiple />`

These versions of OnInputFileChange:

  private async Task OnInputFileChange(InputFileChangeEventArgs e)
    {
        IBrowserFile fi = e.File;
        MemoryStream stream = new MemoryStream();
        await fi.OpenReadStream(fi.Size).CopyToAsync(stream);
    }

 private async Task OnInputFileChange(InputFileChangeEventArgs e)
    {
        await using FileStream fs = new(path, FileMode.Create);
        await browserFile.OpenReadStream().CopyToAsync(fs);
    }

is just one of many iterations, but the issue is always the same:

No bytes or data can be read from the file and it always fails to read the stream and thereby fails to copy to another stream. I get the files metadata, but cannot read from it.

I have tried to increase the message size in program.cs: (The file I am uploading is 8KB)

builder.Services.AddSignalR(options =>
    {
        options.EnableDetailedErrors = true;
        options.MaximumReceiveMessageSize = 102400000; // 100 MB
    });

I have tried to make a hub and do this:

app.MapHub<FileUploadHub>("/fileUploadHub", options =>
    {
        options.ApplicationMaxBufferSize = 102400000; // 100 MB
        options.TransportMaxBufferSize = 102400000;   // 100 MB
        options.LongPolling.PollTimeout = TimeSpan.FromSeconds(30);
    });

Each time I create a new stream I also get this:

ReadTimeout = 'stream.ReadTimeout' threw an exception of type 'System.InvalidOperationException'
WriteTimeout = 'stream.WriteTimeout' threw an exception of type 'System.InvalidOperationException'

Be it MemoryStream or Another kind of stream. I cannot open a stream and read data.

I have done a similar thing in Blazor WebAssembly without issue, so I suspect Blazor Server App.