Custom Content module on Confluence Cloud

Hello,
I’m trying to use the custom content module on confluence cloud and I’m facing a few challenges:
https://developer.atlassian.com/cloud/confluence/modules/custom-content/

Is it possible to create a custom content in an attachment context? Instead of creating a custom content on space or page.

Is it possible to use the custom content without having uiSupport?

Is it possible to manage comments for a custom content?

My goal is to create a custom content which are comments/notes to each attachment (using the Atlassian Comments implementation). I tried to create a custom content with supportedContainerTypes: [“attachment”] and I was able to install the app. When I try to create a custom content using the REST API, I tried to pass the attachmentId but that didn’t work.

Thanks,
Paulo Alves.

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