Google Drive is a cloud storage that users synchronize and store digital content across computers, laptops, and mobile devices.
Now, Android released the new feature which you can install add-ons for this service to extend the mobile apps functionality.
There are only a few of add-ons so far for Docs and Sheets, but it is very useful. The following apps are DocuSign, ProsperWorks, AppSheet, and Scanbot.
Also, You can find some apps including PandaDoc, ZohoCRM, EasyBib, Teacher Aide, and Classroom in Google Play compilation directly from the add-on menus in Docs or Sheets.