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For the iOS app

First, log in your Apple Developer area. Then go to Certificates, Identifiers & Profiles > Identifiers .

You will see list of your existing app identifiers here. Now, you need to create an App Group ID.

Create App Group identifier

Click Plus icon to start creating a new App Group identifier.

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ChooseApp Groups option as the below screenshot. Then Continue.

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• Enter Description and Identifier.  Note that the format is group.[YOUR_PRIMARY_APP_ID]. For example, if your primary app Bundle ID is com.example.ios, then the group Identifier is group.com.example.ios

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• After creating new App Group ID, get back to the list of all identifiers and open the primary app Bundle ID (com.example.ios as in the example ), click Edit 

• Choose the App Group ID you've just created from the list, then Continue and Save

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Create bundle identifier for Share extension

Next, you have to add a new bundle identifier for Share extension (in the same way as you create one for the primary Bundle ID). 

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Great job. We just completed the setup for Share Extension for your iOS app.

For the Android app

Luckily that there are no additional configurations on Google Play. If your Android app has been built with mobile version 1.6 or newer, this feature is already ready to use.