If you make changes to either copy is the other also updated with the new details? If so, this will be a backup copy and can be deactivated by selecting the appropriate option from the saveas submenu from the file menu.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?