Cache Generation Troubleshooting
If no parts appear in the dropdowns, open the Sidekick Character Tool first. If it opens without missing-part errors, regenerate the cache from Game Creator > Settings > HeroBridge > Regenerate Cache.
If the Sidekick tool also reports missing parts, uninstall HeroBridge, delete the Synty folder, reinstall the Sidekick starter pack and tool, and then install HeroBridge again.