I read a serialized Kindle book a couple of years ago. Each month a new section came out and, as I recall, I simply downloaded it again and it overwrote the older smaller copy I already had. It's been a while so I may remember this wrong but I think that was how it worked.
I have a Kobo but I've never tried this with that so I have no idea how it works. I just sideload books to my Kobo.
Barry
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