Can't upload images after 7.1 upgrade

After upgrading our project to 7.1, we are unable to upload images.  We are able to get into the image uploader and browse or drag-drop images, but after the upload completes there is a message box that says "  'MyImage.png' could not be uploaded.  MyImage.png "   An entry appears for the image in the target Library for the image, but the image itself is blank.

 One other thing to mention is that there is a javascript error that occurs while uploading.  This problem occurs across different browser types.

Solved.... The problem was in the web.config file, and was resolved by commenting out the line "<requestLimits maxQueryString="10000" />" as shown below.

  <location path="Telerik.Sitefinity.Html5UploadHandler.ashx">
    <system.web>
      <httpRuntime maxRequestLength="6048000" executionTimeout="7200" maxUrlLength="102400" maxQueryStringLength="102400" requestValidationType="Telerik.Sitefinity.Security.Claims.CustomRequestValidator, Telerik.Sitefinity" />
    </system.web>
    <system.webServer>
      <security>
        <requestFiltering>
          <requestLimits maxAllowedContentLength="2147483648" />
          <!--2GB-->
          <!--<requestLimits maxQueryString="10000" />-->
        </requestFiltering>
      </security>
    </system.webServer>
  </location>

telerik:RadAsyncUpload not working after upgrading to Sitefinity 7.2.5320.0  

I am having similar issue, have been using telerik:RadAsyncUpload on one of our custom module though its no longer working.

Once image is selected it get stuck in uploading without doing anything.

Hello,

So far we have not had other reports of the same issue. Would it be possible to send the control in ticket you have opened so we can try it on our end, please? Once we have resolved the issue, you can share the solution with the community.

Regards,
Atanas Valchev
Telerik

We're using version 8.0.5710.0 and are receiving the same error when attempting to upload images.

'Filename' could not be uploaded. Filename

A few months ago we performed an upgrade from 8.0.5700.0 to 8.0.57​10.0.

Thanks,

Devin

I found a more detailed message in the Developer Console saying, "Configuration element 'requestLimits' already defined". Like Compton, I found that I had the requestLimits element ​listed twice in the web.config but with different attributes.

I combined the attributes from the two elements into one element and can now upload.

Experienced the exact same problem but when upgrading to 7.3.

Resolved it by REPLACING web.config (entirely) with the web.config that comes in the 7.3 Empty Project.