Publishing Problem: index_lms_html5.html file missing

Hi. any help would be greatly appreciated (Storyline 360).

I have been using wonderful Articulate products for a good few years producing some great e-learns. I recently published a new version of an e-learn in exactly the same way as many others, however the person who uploads to the LMS has said that the usual file they link with (which allows successful reporting) is missing. The file name is  'index_lms_html5.html'.

I have not changed any of the publishing settings apart from file version and folder. The attachment shows screenshot of previously published files and newly published files. Can anyone please tell me why this difference in published files is happening?

Thank you.