yes create an image from your bar code here is some sample code 

let z := 'Equipment #';
let k := max(CALIBRATION.'Due Date');
let xname := month(k) + "20" + year(k);
importFile(this, "https://api.qrserver.com/v1/create-qr-code/?size=90x90&data=" + xname, xname + ".png");
Image := xname + ".png";

You will have to create an Image Field.   Than just place the image field on your report.  

Are you on the cloud or on the Mac App? Can you look in the paper clip and see if an attachment is created?  You should also send an email to support@ninox.com and they can do a screen share and walk you throught this also.  Feliz Navidad  

If there is indeed a attachment in the attachment TAB created, I would suggest to change >>BARCODE := xname + ".png";<< to

BARCODE := last(files(this))

Steven