public async Task<UntypedNode?> PostAsync(Body_upload_file_uploadfile__post body, Action<RequestConfiguration<DefaultQueryParameters>>? requestConfiguration = default, CancellationToken cancellationToken = default)
{
#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP3_1_OR_GREATER
#nullable restore
#else
    public async Task<UntypedNode> PostAsync(Body_upload_file_uploadfile__post body, Action<RequestConfiguration<DefaultQueryParameters>> requestConfiguration = default, CancellationToken cancellationToken = default)
    {
#endif
    _ = body ?? throw new ArgumentNullException(nameof(body));
    var requestInfo = ToPostRequestInformation(body, requestConfiguration);
    var errorMapping = new Dictionary<string, ParsableFactory<IParsable>>
    {
        { "422", HTTPValidationError.CreateFromDiscriminatorValue },
    };
    return await RequestAdapter.SendAsync<UntypedNode>(requestInfo, UntypedNode.CreateFromDiscriminatorValue, errorMapping, cancellationToken).ConfigureAwait(false);
}

/// <summary>
/// Upload File
/// </summary>
/// <returns>A <see cref="RequestInformation"/></returns>
/// <param name="body">The request body</param>
/// <param name="requestConfiguration">Configuration for the request such as headers, query parameters, and middleware options.</param>
#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP3_1_OR_GREATER
#nullable enable
public RequestInformation ToPostRequestInformation(Body_upload_file_uploadfile__post body, Action<RequestConfiguration<DefaultQueryParameters>>? requestConfiguration = default)
{
#nullable restore
#else
public RequestInformation ToPostRequestInformation(Body_upload_file_uploadfile__post body, Action<RequestConfiguration<DefaultQueryParameters>> requestConfiguration = default)
{
#endif
    _ = body ?? throw new ArgumentNullException(nameof(body));
    var requestInfo = new RequestInformation(Method.POST, UrlTemplate, PathParameters);
    requestInfo.Configure(requestConfiguration);
    requestInfo.Headers.TryAdd("Accept", "application/json");
    requestInfo.SetContentFromParsable(RequestAdapter, "multipart/form-data", body);
    return requestInfo;
}

// <auto-generated/>
#pragma warning disable CS0618
using Microsoft.Kiota.Abstractions.Extensions;
using Microsoft.Kiota.Abstractions.Serialization;
using System.Collections.Generic;
using System;

[global::System.CodeDom.Compiler.GeneratedCode("Kiota", "1.18.0")]
#pragma warning disable CS1591
public partial class Body_upload_file_uploadfile__post : IAdditionalDataHolder, IParsable
#pragma warning restore CS1591
{
    /// <summary>Stores additional data not described in the OpenAPI description found when deserializing. Can be used for serialization as well.</summary>
    public IDictionary<string, object> AdditionalData { get; set; }

    /// <summary>The file property</summary>
#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP3_1_OR_GREATER
#nullable enable
    public string? File { get; set; }
#nullable restore
#else
    public string File { get; set; }
#endif

    /// <summary>The language property</summary>
#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP3_1_OR_GREATER
#nullable enable
    public string? Language { get; set; }
#nullable restore
#else
    public string Language { get; set; }
#endif

    /// <summary>
    /// Instantiates a new <see cref="Body_upload_file_uploadfile__post"/> and sets the default values.
    /// </summary>
    public Body_upload_file_uploadfile__post()
    {
        AdditionalData = new Dictionary<string, object>();
        Language = "En";
    }

    /// <summary>
    /// Creates a new instance of the appropriate class based on discriminator value
    /// </summary>
    /// <returns>A <see cref="Body_upload_file_uploadfile__post"/></returns>
    /// <param name="parseNode">The parse node to use to read the discriminator value and create the object</param>
    public static Body_upload_file_uploadfile__post CreateFromDiscriminatorValue(IParseNode parseNode)
    {
        _ = parseNode ?? throw new ArgumentNullException(nameof(parseNode));
        return new Body_upload_file_uploadfile__post();
    }

    /// <summary>
    /// The deserialization information for the current model
    /// </summary>
    /// <returns>A IDictionary&lt;string, Action&lt;IParseNode&gt;&gt;</returns>
    public virtual IDictionary<string, Action<IParseNode>> GetFieldDeserializers()
    {
        return new Dictionary<string, Action<IParseNode>>
        {
            { "file", n => { File = n.GetStringValue(); } },
            { "language", n => { Language = n.GetStringValue(); } },
        };
    }

    /// <summary>
    /// Serializes information the current object
    /// </summary>
    /// <param name="writer">Serialization writer to use to serialize this model</param>
    public virtual void Serialize(ISerializationWriter writer)
    {
        _ = writer ?? throw new ArgumentNullException(nameof(writer));
        writer.WriteStringValue("file", File);
        writer.WriteStringValue("language", Language);
        writer.WriteAdditionalData(AdditionalData);
    }
}
#pragma warning restore CS0618

public async Task<?> PostAsync(MultipartBody body, Action<RequestBuilderPostRequestConfiguration>? requestConfiguration = default, CancellationToken cancellationToken = default)