ePub fixed layout problem with 4 pictures: Sigil: not declared in the manifesto

This first error message is telling you that the files referenced are not declared in the <manifest> section of the content.opf file. 4 images used in your epub are missing an entry in that <manifest> section.

It is known that InDesign may convert placed vector files to either .jpg or .png files, and the file extension used for the files in that content.opf <manifest> section may not match the ones that are actually saved in the epub file.

Open the file Sigil, and open the content.opf file.

So first check if all the image file extensions of those four images match with ones in the <manifest> section. If not, change the extensions to the correct ones.

If a used image file is not listed in the manifest, you will have to add an entry for it.

When you view the ePub do the images appear correctly?