Issue Summary

When performing a custom space export for a huge space, building of the tree can hit the proxy time-out and the custom export cannot proceed.

Steps to Reproduce

1. Identify a huge space
2. Space Tools > Content Tools > Export > PDF > Custom

Suggestion - Please enhance a specific page within the space export flow with the transition to AFM. This update focuses on the section where users select the pages they wish to export. Rather than replicating the current experience,introduce an improved collapsible interface. This change aims to alleviate load failures associated with particularly large spaces and minimize user friction

AFM stands for Atlassian Frontend Monorepo. It is a mono repository that contains several different workspaces owned by various teams at Atlassian.