Yes, Samsung Galaxy A7 2018 supports OTG. USB OTG or USB On-The-Go is one of the most recent technologies that allows you to connect your pen drives and in some cases hard disks to your smartphones and tablets. It has a cable and through that cable, you can directly view and use your pen drive in your smartphones.
You can find the specs of Samsung Galaxy A7 2018 here: Samsung Galaxy A7 2018
Prashant Raigur Pacific