We recommend that you use meaningful images that convey information in a more effective way than by using text. Avoid images of text and of tables as this are not accessible.
Uploading images to Moodle is a two-stage process:
When you add new content to a section it defaults to the bottom of the section. You can move it to a new location within the section it was created in or move it to a new section.
You can also move content using module index.