> I just had my server provider upgrade my Moodle site version 1.9.7 upgraded to 2.5.1
Really? That was just one single step for you? Can you disclose the provider? I'm sure that provider can save many moodlers!
> In the old version I was able to upload html files that I had created externally and which from a course page were accessible via links. I could then edit these html files directly within the Moodle file manager.
I doubt that you could edit them. Still I know the work flow and miss it in Moodle 2. As a work-around you can zip the HTML, upload as one file as a file resource, unzip and "set main file".