How can I download image in Confluence Page?

I want to download image with asApp() and paste it other product with api.
I will show my code following.

const baseUrl = “https://example.atlassian.net/wiki”;
const downloadUrl = attachment._links.download;
const fullImageUrl = ${baseUrl}${downloadUrl};

const imageResponse = await asApp().requestConfluence(route`fullImageUrl`, { method: 'GET' });
console.log('imageResponse: ', imageResponse);

The baseUrl is my site url and downloadUrl is like following.

/download/attachments/{my-page-id}/{my-image-filename}?version=1&modificationDate=1731594031029&cacheVersion=1&api=v2

This won’t work because of disallowing path manipulation attempt.

Please tell me where to fix.