Set these under components.Attachments in your token file, or pass them to ThemeScope to change one region of the page. The file cards are drawn by FileCard, so their tokens are on its page.
Component Tokens
Ant Design X's own Attachments token, with the value its default seed produces. Set it and it applies to every Attachments under the provider.
Global Tokens
The global tokens Attachments reads. Set one under components.Attachments to change it for Attachments only, or at the top level to change every component.