How to include images in markdown guides

[Bart_Frenk]

I have a markdown file Architecture.md

## Database schema

![schema](schema.png)

## Components

![diagram](architecture.png)

in folder /assets/sections/swagger-api/templates/guides; both the images are in the same folder. The images don't show up on the rendered page under Architecture, although all the files in that folder do appear as sections.