The user should only be able to select from the images that are uploaded to the children of this page … but I can’t figure out how. I think I misunterstood something in the documentation.
There is a difference between files sections and fields. The uploads: false options is avaialble on files fields, not sections.
The reference in the docuementation you qouted is for fields, not sections. You will need to switch your blueprint over so thati uses a files field rather then a section.
The main difference is that fieilds store content in the content files. Sections are for display / organising pages and files etc but they dont make any entries to the content files.
You can use the query language to make the field display images from the child pages.
For example -
query: page.children.images.
Its possible to ad a filter to that query if you dont want htings like PDFs to show as being selectable.