Do you your tests on a localhost? If so, please have in mind that on a localhost the upload speed is extremely high, reachign 10-20 megabytes per second. This means that 6mb file is going to be uploaded in less that a second, i.e. before there is enough time for the area to appear. Try uploading file of size at least 50mb in order to see the area on a localhost.
All the best,
the Telerik team
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