For Huawei, the recommended solution is to disable the OS’ Battery Optimization for Bob:
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Go to → Settings → Apps
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Tap the 3-dots button → Special access → Battery optimization
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On the top-left corner tap the “Not allowed” button and it to “All apps”
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Search for Bob and select it → select “Don’t allow”
Another thing we recommend (if available on your model):
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Phone settings → Battery → App launch and then set your app to “Manage manually” and make sure everything is turned on.
And last – "lock" bob, in order to prevent it from being closed by the OS:
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Open the bob app
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Tap the square icon at the bottom of the Android toolbar to see your recently opened apps
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Find the bob screenshot and drag it down, then release it
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Now a lock icon should appear on the bob screenshot