I've submitted my app for review to the App Store Connect. Although the app is still under review, I've received an email to inform me that I have to fix an error. Here is the content of the message:
We identified one or more issues with a recent delivery for your app
XXXXX. Your delivery was successful, but you may wish to correct the
following issues in your next delivery:
"Missing Purpose String in Info.plist File. Your app's code
references one or more APIs that access sensitive user data. The
app's Info.plist file should contain a
NSLocationAlwaysUsageDescription key with a user-facing purpose
string explaining clearly and completely why your app needs the data.
Starting spring 2019, all apps submitted to the App Store that access
user data will be required to include a purpose string.If you're
using external libraries or SDKs, they may reference APIs that
require a purpose string. While your app might not use these APIs, a
purpose string is still required. You can contact the developer of
the library or SDK and request they release a version of their code
that doesn't contain the APIs.
After you’ve corrected the issues, you can use Xcode or Application
Loader to upload a new binary to iTunes Connect.
The App Store Team
My app is fully built with Expo and I don't know how to access and modify the Info.plist.