UDUdhayaKumar Duraisamy Syncfusion Team October 12, 2022 12:15 PM
We have validated the shared sample on our end. In your scenario, you are
trying to upload a single file at a time. So, We suggest you remove the SequentialUpload
property or set SequentialUpload as false to resolve the reported issue on your
end. When we upload multiple files (AllowMultiple = true) at the same time and If the SequentialUpload property is enabled, the file upload component performs the
upload one after the other.