I am trying to create a multimedia component in SDL web 8.5

Multimedia type is : mp4

Size of the file is 860 MB

Uploading the file works fine. while saving the item it gives the below error. 
[![enter image description here][1]][1]


Steps taken :
1. Added the following code in web config file located under \WebUI\WebRoot

    <system.web>
      <httpRuntime  executionTimeout="100000" maxRequestLength="1073741824" />
    </system.web>

    <system.webServer>
       <security>
          <requestFiltering>
             <requestLimits maxAllowedContentLength="1073741824"/>
          </requestFiltering>
       </security>
   </system.webServer>

2.Increased the maximum upload size in IIS to 1073741824 from IIS manager and restarted the IIS
Can you tell the solution for the above problem.


  [1]: https://i.sstatic.net/HKoYT.png