Hi Joaquín,
There are some already known limitations of
RadProgressArea. One of them is that the cancelling of the upload is not supported in Safary and, respectively, in Google Chrome.
There is more detailed information on the subject available in the following link:
RadProgressArea Known Limitations.
Additionally, there is an available built-in AsyncUpload functionality in RadFileExplore where the progress monitoring is done in real time with no need of additional customizations (the cancelling of the upload is working properly in there). In order to enable it the EnableAsyncUpload property must be set to true.
Kind regards,
Veselina
the Telerik team
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