Trying to be clear as I am changing things based on your suggestions, which seem to have worked in allowing me to upload the file locally (no errors), but doesn’t work when running the page from the server.
I have yet to run the page locally when logged into the server, but will do that and report back.
I hope you’ve seen the behavior by now on the page in questions where the file seems to upload (progress bar shows), but there’s an error at the end of the process and then the failure message in red.
My current question is about any IIS configurations that might need to be checked specifically when dealing with uploading files.
BTW - I want to say thank you for being so active in helping me. This is very encouraging when making a purchasing decision. Now we just have to get things working on the server.