Copy Attachment from attachment type variable to Data Source using Client callable script include

[Revanth111]

I have a attachment variable on the catalog form and I created a on change catalog client script that calls Script Include to Copy the attachment from  the variable to data source in script include.

Tried multiple script and it doesn't do anything

var attachmentSysId = this.getParameter('sysparm_attachment_id');
        var dataSourceSysId = 'a73774132f4c8710b456202bcfa4e3cc';
        var gsa = new GlideSysAttachment();
        var grAtt = new GlideRecord('sys_attachment');
        grAtt.addQuery('table_sys_id', dataSourceSysId);
        grAtt.query();
        while (grAtt.next()) {
            grAtt.deleteRecord();
        }
        //Copy New attachment to Data source and transfor it
        var grAttachment = new GlideRecord('sys_attachment');
        if (grAttachment.get(attachmentSysId)) {
            var grDataSource = new GlideRecord("sys_data_source");
            if (grDataSource.get(dataSourceSysId)) {
                //Copy Attachment to Data Source
                // gsa.copy(grAttachment.table_name, grAttachment.table_sys_id, 'sys_data_source', dataSourceSysId);
              //gsa.copy('ZZ_YYsc_cart_item', attachmentSysId, 'sys_data_source', dataSourceSysId);
//gsa.copy('sys_attachment',attachmentSysId,  'sys_data_source',dataSourceSysId);