Import dynamic html created by OmniOutliner

I spent several hours working on an outline in OmniOutliner and exported it to an html file to share with a colleague, which I still have. Somehow I managed to not save the OmniOutline file however. I’ve searched and searched and searched and it’s nowhere on my computer. I’m a little perplexed about how this happened without being prompted to save the file and I really thought I had saved it, but no such luck. So, I’m wondering if there is any way to import the dynamic html file I exported back into OmniOutliner so I don’t have to manually recreate everything. If there is, please let me know.