Text Integration for Children’s EPUB

I already have a fully-functional EPUB3 file that contains every illustration for my children’s book; what’s missing is the master text, I have the text I just need it integrated into the illustrations that contain the wrong text. I need that text flowed cleanly into the existing pages so the book remains 100 % reflowable and displays perfectly on all Kindle devices and apps. There are no animations, audio, or other interactive widgets in the file—just images and the text you will add. The layout must stay responsive, letting the reader resize fonts or change orientation without breaking image placement or causing awkward page breaks. You will work directly in the EPUB3 package, preserve the current image resolutions, embed the supplied fonts, and validate everything with Kindle Previewer before handing the book back. Please deliver: • Updated EPUB3 ready for KDP upload • Validation report (EPUBCheck + Kindle Previewer screenshots) • Brief note of any tweaks made to CSS or HTML If you have recent experience preparing reflowable children’s titles for Amazon, this should be a straightforward task.