This functionality is not supported at this time. The uploadUrl option is passed to the upload widget's saveUrl, which does not support a function parameter. You can submit this as a feature request on UserVoice
. Until it is supported, you might need to destroy and re-initialize the editor with the different options, or attempt to change the saveUrl dynamically by $("[data-role=upload]").data("kendoUpload").options.async.saveUrl = "foo";
-- although this may be considered a tad hacky.
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