Adding html file after publication of issue


I’m looking for information on if it is possible to add an html galley (in addition to a PDF galley) once an issue has been published? Would it be best to unpublish and add or create a new version of the submission? We don’t want to alter the original publication date/citation year by adding an html file and I’m not sure if these steps would do that.

Thanks in advance

If the content of the HTML is the same as the PDF, I wouldn’t create a new version.
Unpublish, upload the HTML galley, publish is the way to go. If you unpublish/publish a single article, the publication date is not changed. If you unpublish a whole issue, the publication date for the articles will be changed when you publish again. So you should do the former.