Adding Attachment to Item using Rest Api

Dear All,

I am trying to add an attachment to an item using this URL:

https<application_domain>/fscmRestApi/resources/11.13.18.05/itemsV2/{itemsV2UniqID}/child/ItemAttachment

Payload Request:
{
"Url":"https://buyfilteronline.s3-eu-west1.amazonaws.com/resources/0/0/17/6215714200_b.jpg",
"DatatypeCode":"WEB_PAGE",
"CategoryName":"BROCHURE"
}

The API returns a success response, but nothing happens from ERP cloud.

Please advise,