Uplaoded Image but with 0 KB size - iis

Question

I'm using .NET Core 3.1 but I encountered a weird problem!
the problem is any uploaded image the size of it is 0KB
when I restart the IIS and trying again will upload it without any problem but after that, the problem returns back.
I tried this solution by making my code async but with no luck
I changed my system file to be accessible by my Application pool user but with no luck
Here is my code :
public Document shareWithUsers([FromForm] CreateDocumentDto documentDto)
{
List<CreateUserType1DocumentsDto> listOfCreateUserType1Documents = new List<CreateUserType1DocumentsDto>();
List<CreateHDDocumentsDto> listOfCreateHDDocuments = new List<CreateHDDocumentsDto>();
if (documentDto.listOfUserType1Documents != null)
{
foreach (var item in documentDto.listOfUserType1Documents)
{
listOfCreateUserType1Documents.Add(JsonConvert.DeserializeObject<CreateUserType1DocumentsDto>(item));
}
}
else if (documentDto.listOfHDDocuments != null)
{
foreach (var item in documentDto.listOfHDDocuments)
{
listOfCreateHDDocuments.Add(JsonConvert.DeserializeObject<CreateHDDocumentsDto>(item));
}
}
if (documentDto.sharedText == null)
{
if (documentDto.document != null) //that mean user upload file
{
if (documentDto.document.Length > 0)
{
var UploadedFilesPath = Path.Combine(hosting.WebRootPath/*wwwroot path*/, "UploadedFiles" /*folder name in wwwroot path*/);
var filePath = Path.Combine(UploadedFilesPath, documentDto.document.FileName);
//documentDto.docUrl = filePath;
var documentObject = new Document();
using (var stream = new FileStream(filePath, FileMode.Create))
{
documentDto.document.CopyToAsync(stream);// Use stream
}
if (documentDto.listOfUserType1Documents != null)
{
documentObject.listOfUserType1Documents = ObjectMapper.Map<List<UserType1Documents>>(listOfCreateUserType1Documents);
}
else if (documentDto.listOfHDDocuments != null)
{
documentObject.listOfHDDocuments = ObjectMapper.Map<List<HDDocuments>>(listOfCreateHDDocuments);
}
documentObject.docTtitle = documentDto.docTtitle;
documentObject.docName = documentDto.docName;
documentObject.docUrl = filePath;
return _repository.Insert(documentObject);
}
}
}
else
{ //that mean user upload text
var documentObject = new Document();
if (documentDto.listOfUserType1Documents != null)
{
documentObject.listOfUserType1Documents = ObjectMapper.Map<List<UserType1Documents>>(listOfCreateUserType1Documents);
}
else if (documentDto.listOfHDDocuments != null)
{
documentObject.listOfHDDocuments = ObjectMapper.Map<List<HDDocuments>>(listOfCreateHDDocuments);
}
documentObject.sharedText = documentDto.sharedText;
return _repository.Insert(documentObject);
}
return null;
}

Answer 1

My code works only if I change both of them (CopyTo and Insert ) to Async with await
await CopyToAsync()
await InsertAsync()