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We have analysed your previous incident history and created a sample in framework 2.0 based on your previous requirement to test the reported scenario. Unfortunately, we were unable to reproduce the error at our end.
Could you please provide us the sample to check this issue? This would help us to sort out the root causes of the issue and provide you a better solution.
Also, please let us know whether you have tried to access the xhr object to upload the files? If so, please share the details with us.
If you have any other queries, please let us know.
Thanks for the update.
We are glad that your issues have been resolved.
Please contact us in future if you have any queries.