Unfortunately, RadUpload cannot select multiple files in one file select box. This is a limitation of the standard <input type=file>
elements that RadUpload
uses for file selection. Currently, there are no plans for changing this restriction. However, your client can try to upload all the required files as a zip files and then automatically extract them on the server.
For reference you can check this code-library: How to upload multiple files using RadUpload (uploading
.zip file and extract it on the server)
the Telerik team
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