I would think you would need to use the onUpload method of the uploader and call the Sharepoint API with the file information.
This might help you get on your way: https://sharepoint.stackexchange.com/questions/138893/upload-new-image-in-asset-library-in-sharepoint-online
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Plamen
Telerik team
answered on 26 Jun 2018, 10:02 AM
Hello,
You could also check the usearraybuffer property - when it is set to true the files are read as a file buffer by using FileReader. This buffer is sent in the request body.