Model is null while rendering view

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C#4.0

model

controller

Razor

MVC4

I have a child view name UploadImage and parent view name CROCOnfig, when I access child view by using button in parent view,it works fine, but when I try to render child view in parent view,it throws error that model is null. I have placed child view model in parent view model. I have debug the code line by line,but could not figure out the reason, I am sharing some of my code below,

public CombinedLogoModel LogoModel {get;set;} this line says LogoModel is null while rendring view

What I have tried:

This is what I have tried

public class VM_LogoImageModel : ModelBase
    {
        //private ILogoImageRepository LogoImageRepo = null;

        #region Table Attribute LogoImage 
        public int ImageId { get; set; }
        public string FileOriginalName { get; set; }
        public string FileName { get; set; }
        public string Title { get; set; }
        public Nullable<bool> IsDeleted { get; set; }
        public Nullable<bool> IsActive { get; set; }
        public Nullable<int> LogoType { get; set; }
        public Nullable<int> FileExtension { get; set; }
        public int CROID { get; set; }

        //public VM_CRO RMO_CRO { get; set; }

        #endregion
    }
    #endregion


    public class CombinedLogoModel
    {
        public IEnumerable<vm_logoimagemodel> LogoImageModels { get; set; }
        public VM_LogoImageModel SingleLogoImageModel { get; set; }
    }

public class VM_CROPortalCOnfiguration
{
    public CombinedLogoModel LogoModel {get;set;}
}

public ActionResult UploadImage()
{
    var AllLogos = logoImage.GetAllLogos();

    var AllLogosViewModels = AllLogos.Select(Mapper.MapToVM_LogoImageModel).ToList();

    var LastUploadedLogos = VM_LogoImageModel.GetLastUploadedLogos(AllLogosViewModels);

    //some other code
    var CombinedViewModel = new CombinedLogoModel
    {
        LogoImageModels = LastUploadedLogos,
        SingleLogoImageModel=LastUploadedLogos.FirstOrDefault()
    };

    var CroPortalCombined = new VM_CROPortalConfiguration
    {
        LogoModel = CombinedViewModel
    };
            
    return View("UploadImage", layout, CroPortalCombined);
}

@Html.Partial("~/Views/LogoImage/UploadImage.cshtml",Model)