"Synchronous reads are not supported" when writing a stream

[becdetat]

I'm using Blazor to upload files. This version of my upload method fails:

    public async Task UploadFail(IBrowserFile file)
    {
        using var db = await _dbFactory.GetDatabase();
        var stream = file.OpenReadStream(file.Size);
        await db.FileStorage.UploadAsync("test", file.Name, stream);
    }

The call stack is (trimmed):

LiteDB.Async.LiteAsyncException: LiteDb encounter an error. Details in the inner exception.
       ---> System.NotSupportedException: Synchronous reads are not supported.
         at Microsoft.AspNetCore.Components.Forms.BrowserFileStream.Read(Byte[] buffer, Int32 offset, Int32 count)
         at System.IO.Stream.CopyTo(Stream destination, Int32 bufferSize)
         at LiteDB.LiteStorage`1.Upload(TFileId id, String filename, Stream stream, BsonDocument metadata)
         at LiteDB.Async.LiteStorageAsync`1.<>c__DisplayClass11_0.<UploadAsync>b__0()
         at LiteDB.Async.LiteDatabaseAsync.<>c__DisplayClass36_0`1.<EnqueueAsync>g__Function|0()

If I change it to use an intermediary MemoryStream it works, but I have a feeling that this would buffer the entire file into memory a second time. Here's my workaround though:

var stream = new MemoryStream();
await file.OpenReadStream(file.Size).CopyToAsync(stream);
stream.Seek(0, SeekOrigin.Begin);
await db.FileStorage.UploadAsync(image.Id.ToString(), image.Filename, stream);