I am receiving an issue when I upload a file of size 10 MB. The issue is that browser gets frozen immediately after selecting the file for some time(40 seconds for the excel file and I cannot attach the file here as it's accepting max 2 MB), and we cannot perform any activity on the browser. We experienced the same issue on the below link that is given by Telerik team member in one of the threads. Please note that this is happening only on https site, whereas it's working fine on http site.
Telerik demo site:
Below is the thread link where the above link is mentioned to check if the issue exists:
Please let me know if any questions or you need any information.