This is often the "gatekeeper" topic for intermediate devs. If you see the term @Inject or @Module and get confused, this is your next study topic.
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If you own a device like the S6 Ultra running BigdroidOS 2.0.1 and cannot find the Google Play Store, you may need to side-load applications manually. Expert advice from JustAnswer recommends the following steps for common streaming apps: bigdroidos 201 link