Added some folders.

APIControllers/DeletePost.cs

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+using Microsoft.AspNetCore.Mvc;
+using NeDvachAPI.DBControllers;
+
+namespace NeDvachAPI.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class DeletePostController : ControllerBase
+    {
+        [HttpDelete("{id}")]
+        public JsonResult Get(string id)
+        {
+            DBchat.DeletePost(id);
+            return new JsonResult("Deleted Successfully!");
+
+        }
+    }
+}

APIControllers/GetPosts.cs

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+using Microsoft.AspNetCore.Mvc;
+using NeDvachAPI.BufferControllers;
+using System.Text.Json;
+using System.Web.Http;
+using HttpGetAttribute = Microsoft.AspNetCore.Mvc.HttpGetAttribute;
+using RouteAttribute = Microsoft.AspNetCore.Mvc.RouteAttribute;
+
+namespace NeDvachAPI.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class ListController : ControllerBase
+    {
+        [HttpGet(Name = "GetPosts")]
+        public string Get([FromUri] string board, int thread)
+        {
+            string postsJson = JsonSerializer.Serialize(APIThreadBuffer.GetThread(thread));
+            return postsJson ;
+        }
+    }
+}

APIControllers/PictureUpload.cs

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+using Microsoft.AspNetCore.Mvc;
+using NeDvachAPI.DBControllers;
+
+
+namespace NeDvachAPI.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class UploadPic : ControllerBase
+    {                
+
+
+        [HttpPost(Name = "UploadPicture")]
+        public async Task<JsonResult> ReceivePost([FromForm] IFormFile PostPicture)
+        {
+            var supportedTypes = new[] { "jpg", "png" };
+            string receivedFileName = PostPicture.FileName;
+            string fileExt = receivedFileName.Substring((receivedFileName.Length) - 3, 3);
+            if (supportedTypes.Contains(fileExt))  //file type check
+            {
+                ///Local Buffer File Part
+                string filePath;
+                filePath = Directory.GetCurrentDirectory() + "\\Buffer\\" + receivedFileName;
+                Stream picBuffer = new FileStream(filePath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
+                PostPicture.CopyTo(picBuffer);
+                picBuffer.Close();
+                ///MinIo part
+                JsonResult picAdress = new(await MinIOchat.PictureUpload(filePath, receivedFileName));
+                Console.WriteLine("Загружен файл:" + "http://static.vdk2ch.ru:15555/thread-pics/" + receivedFileName);
+                return picAdress;
+            }
+
+            else return new JsonResult("Неверный тип файла");
+        }
+
+        
+    }
+    
+}

APIControllers/PostPost.cs

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+using Microsoft.AspNetCore.Mvc;
+using NeDvachAPI.BufferControllers;
+using NeDvachAPI.DBControllers;
+using NeDvachAPI.Models;
+using System.Text.Json;
+
+namespace NeDvachAPI.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class PostToController : ControllerBase
+    {
+        [HttpPost(Name = "PostPosts")]
+        public JsonResult ReceivePost([FromBody] Post ReceivedPost)
+        {
+            string ipAddress = Request.HttpContext.Connection.RemoteIpAddress.ToString();
+            ReceivedPost.Ip = ipAddress;
+            try
+            {
+                DBchat.SendPost(ReceivedPost);
+                APIThreadBuffer.RefreshThread(ReceivedPost.Thread_Id);
+                return new JsonResult("Сообщение успешно добавлено.");
+            }
+            catch
+            {
+                return new JsonResult("Произошла ошибка постинга");
+            }
+        }
+    }
+}

APIControllers/ShowThreads.cs

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+using Microsoft.AspNetCore.Mvc;
+using NeDvachAPI.BufferControllers;
+using System.Text.Json;
+using System.Web.Http;
+using HttpGetAttribute = Microsoft.AspNetCore.Mvc.HttpGetAttribute;
+using RouteAttribute = Microsoft.AspNetCore.Mvc.RouteAttribute;
+
+namespace NeDvachAPI.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class ThreadsController : ControllerBase
+    {
+        [HttpGet(Name = "GetThreads")]
+        public string Get([FromUri] string board)
+        {
+           string postsJson = JsonSerializer.Serialize(APIThreadBuffer.GetThreadPreviews());
+           return postsJson;
+        }
+    }
+}

APIControllers/TestPosting.cs

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+using Microsoft.AspNetCore.Mvc;
+using System.Net;
+using System.Text.Json;
+
+namespace NeDvachAPI.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class TestPostingController : ControllerBase
+    {
+        [HttpPost]
+        public int Area([FromForm] int height , int altitude)
+        {
+            //DBchat.SendPost(ReceivedPost);
+            Console.WriteLine("Received! " + height + " " + altitude );
+            return 200;
+        }
+    }
+}