Back in early 2017 Google launched instant Apps for Nexus and Pixel Devices running 7.x.x. You may ask what is instant Apps? Instant Apps allow you to access a cloud-based version of the app on your Android phone without requiring you to install it from the Play Store.
How to enable on ZTE devices?
It is actually pretty easy process. Go to Settings > Google > (under "Services") look for Instant Apps.
Enable the feature with the correct Gmail account, you use on Play Store for apps, media, etc.
Please let us know if you have any questions.