Submitting project attachments with Attachments using REST API

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We are trying to make use of REST API to create Budgets, add attachments and submit the budgets for Workflow Approval notification (Baseline).

We are making use of Budget REST API to set the plan version status to Baseline to trigger workflow,
https://docs.oracle.com/en/cloud/saas/project-management/21b/fapap/op-projectbudgets-planversionid-patch.html

{"PlanVersionStatus" : "Baseline"}

However, when we submit a budget for approval, we can make use of 2 check boxes "Add Project attachments to workflow notification" and "Add Budget attachments to workflow notification" for sending attachments with email notifications. However when we setting the Baseline status through RESTAPI, we do not get the attachments in the email notification.