It’s not clear to me how the files look on disk (i.e. before importing) and after. Nor what the image links look like exactly.
notebook
|-- note1.md
|-- note2.md
|-- images
|-- image1.png
|-- image2.png
And then in note1.md

Or something like
parent
|-- notebook
|-- note1.md
|-- note2.md
|-- images
|-- image1.png
|-- image2.png
And then in note1.md

Or something else? Screenshots (of the folders etc) and code samples (of the MD files) might help.