Error 405 when calling API from android

1- I am building an application front/back end using Visual Studio 2022 as the back end for Image upload file and it is tested using Postman it uploads the image to the server Successfully

2- I am trying to call the API from android studio and I am using the following code

void DoActualRequest(File f)
{
    String Excep_tion;
    String url="http://192.168.1.6:46829/api/ImageUpload";
    Toast.makeText(this, "OKHTTP3_VJ_Files , Calles actual Reuquest"+url,Toast.LENGTH_SHORT).show(); //

     new  Thread()
     {
        @Override
         public void run()
           {
               final int flag;
                try
                {
                    OkHttpClient client=new OkHttpClient();

                    RequestBody  requestBody=new MultipartBody.Builder()
                            .setType(MultipartBody.FORM)
                            .addFormDataPart("files",f.getName(),RequestBody.create(MediaType.parse("image/jpeg"),f) )
                            .build();

                    //  Toast.makeText(this, "OKHTTP3_VJ_Files , Request body generated", Toast.LENGTH_SHORT).show(); //

                    okhttp3.Request request=new  okhttp3.Request.Builder()
                            .url(url)
                            .post(requestBody)
                            .build();

                    try {

                        //Network on Main Thread Exception happened beacuse of long communication with server
                        //without making this commnication in background
                        //https://stackoverflow.com/questions/6343166/how-can-i-fix-android-os-networkonmainthreadexception
                        //to solve this problem we used the thread technique

                        okhttp3.Response response = client.newCall(request).execute();
                        //  Toast.makeText(this, "response"+response.body().toString(), Toast.LENGTH_SHORT).show(); //
                        //---------------------------when there is response send the results to the main thread------------
                        if(response.isSuccessful()) {
                            Toast.makeText(MainActivity.this, "successful response", Toast.LENGTH_SHORT).show();
                            flag=1;
                        }
                        else {
                            Toast.makeText(MainActivity.this, "" + response.body(), Toast.LENGTH_SHORT).show();
                            flag=0;
                        }
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                // Post the result to the main thread
                               if(flag==1)
                                   Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
                               else
                                   Toast.makeText(MainActivity.this, "NOT OK", Toast.LENGTH_SHORT).show();
                            }
                        });
                        //----------------------------------------



                    }catch(Exception ex)
                    { //ex.getCause().toString();
                        //Log.d("OKHTTP3_VJ_Files","Exception Occured");
                        //Toast.makeText(this,ex.getMessage().toString() , Toast.LENGTH_SHORT).show();
                        Toast.makeText(MainActivity.this, ex.getMessage().toString(), Toast.LENGTH_SHORT).show();
                        ex.printStackTrace();
                    }


                }catch(Exception ex)
                {
                    Toast.makeText(MainActivity.this, ex.getCause().toString(), Toast.LENGTH_SHORT).show();
                    ex.printStackTrace();

                }



           }//end run function



     }.start();


}//Do Actual Request

3-when I am trying to use the above function I got error : 400 Bad request ? even it is tested in postman ,i tried the to test other Browser but the problem persists , Any explanation for this error 5- Also I directly tested the link in the Browser i got the following Error when using the IP address 192.168.1.6

4-and when using the URL : http://localhost:46829/api/ImageUpload i got the folowing Error 405

thanks in advance