Unfortunately we're not sure what is causing the exception as the FileUploadFailed
event is fired with no error. Basically you can try the suggestions in our troubleshooting
article to see if they will help. Also, you can debug your UploadHandler
class implementation by overriding the SaveChinkData
() method and putting a breakpoint in it to see if it's ever called and if it is to see if there are any errors thrown there.
The upload process might also fail if the control can't find the path to the handler indicated by the UploadServiceUrl
property. So if you're using a relative path to access the handler, you can change it to absolute to see if this will fix the issue. Also,in this case please make sure that the UploadHandler
can be accessed from the client-side application.
All the best,
the Telerik team
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