I have a SharePoint 2013 on-premises site and I have owner access on it. There is a requirement to create a customized forms using HTML and CSS for which we are using content editor web parts for which the HTML file is being referred from Site Assets gallery but when we change anything in HTML file or any file in that matter and try to upload it again to Site Assets it gives an error saying "Error with request to the server: unexpected response from server., StackTrace:". Please find the screenshot attached for better understanding of the error,
There are currently multiple issues with Chrome and SharePoint due to the recent changes in Chrome behavior. There is currently no fix for it from MS.
Please see this knowledge base article. https://docs.microsoft.com/en-us/office365/troubleshoot/miscellaneous/chrome-behavior-affects-applications