Try using Kindleunpack instead of converting to epub from azw3 using whatever approach you are using.
There is no way to turn that merge warning message off.
That said you could easily merge all chapters into one big file all at once *after* using Find and Replace to insert Sigil Split Markers were you want the actual splits to be. Then do a Split At Markers.
So only one warning message generated.
Last edited by KevinH; 12-11-2020 at 02:55 PM.
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