The Image Browser upload functionality requires the ImageUpload.aspx file on the site. This property tells the Image Browser where that file is located.

If CanUpload is true this property must be set.

Note: To prevent files that are larger than acceptable from being uploaded, a separate Web.config file should also be located in this folder. That configuration file should set the maxRequestLength to an appropriate amount, generally slightly larger that the MaxUploadFileSizeInKB setting.

Set the property declaratively in the HtmlEditor tag:

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AspxDirectory = "~/ImageBrowser/Aspx"

Set the maxRequestLength in the related Web.config:

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<?xml version="1.0"?>
<configuration>
    <system.web>
        <httpRuntime maxRequestLength="260"/>
    </system.web>
</configuration>