The option of changing the profile picture from the app was built on an older system connected to G+ that no longer works. You can try using a desktop browser or http://aboutme.google.com on mobile browser. Hope this clarifies.
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Replying to @TeamYouTube
The option for http://aboutme.google.com works well for me on my Android phone. Just tried it and it's super fast. Thanks @TeamYouTube
4:12 PM - 7 May 2019
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