Motorola Android Smartphones always came with Stock Android UI, without any bloatware including a File Manager. Since 2016 Motorola started Including File Manager into their new Devices. The New Moto File manager made it's first Appearance in Moto G 2016.
The New version of Moto File Manager App is now available on Play store for Almost All Motorola Smartphones with Android 5.0 and above. Moto File Manager v3.6.68 new update brings "Stability Fixes" and "Bugs Fixes".
You can Download The Moto File Manager Application from Play Store.