I am testing OTRS 6 on an Ubuntu Server using Win 10 with a Chrome browser. I hope my issue is beginner kind

During ticket creation, when I make an attachment for example *.png file, I see the loading screen coming to and end and looks all fine. And then I click Send. I am missing this attachment in email notification and also when I open that ticket as an Agent in its interface.
Please help. Thank you in advance!