Transform html to remove pagebreaks = merging files

[Siavahda]

I want to remove any instances of <div class="mbp_pagebreak" id="calibre_pb_\d+"></div> as part of the conversion process.

But if I use the transform html tool/function, instead of the end epub having one chapter per file, a bunch of the files get merged together and it's a mess.

I'm using 'if the tag has class mbp_pagebreak remove tag only'. I cannot stress enough that I don't know what I'm doing here, so possibly the issue is I'm using the wrong rule! I have experimented with other rules but they either don't remove the mbp_pagebreak or files get merged together.

Don't know if I'm doing something wrong or if this just isn't doable as part of conversion?