Extract form attachments and send the attachments in an e-mail in power automate workflow.
The following video explains the steps needed to form attachments from the submitted data.

The following is the attachment object schema that you need to use in the Parse JSON schema step

{
    "type": "object",
    "properties": {
        "filename": {
            "type": "string"
        },
        "data": {
            "type": "string"
        },
        "contentType": {
            "type": "string"
        },
        "size": {
            "type": "integer"
        }
    }
}