To allow this app to run in the background without being limited by the Android system, please read and follow the following tips.

Huawei

Phone settings > Advanced Settings > Battery manager > Power plan is set to Performance
Phone Settings > Advanced Settings > Battery Manager > Protected apps – check Do It Later as Protected
Phone Settings > Apps > Your app > Battery > Power-intensive prompt [x] and Keep running after screen off [x]
Phone settings > Apps > Advanced (At the bottom) > Ignore optimisations > Press Allowed > All apps > Find Do It Later on the list and set to Allow

Huawei P9 Plus:

Phone settings > Apps > Settings > Special access > Ignore battery optimisation > select allow for Do It Later.

Huawei P20:

Phone settings > Battery > App launch and then set Do It Later to “Manage manually” and make sure everything is turned on.

Nokia

Go to Phone settings > Apps > See all apps.
Tap on the right top corner menu > Show system.
Find Battery protection app in the list, select it and Force close. It will remain stopped until the next restart. From now on, background apps should work normally.

OnePlus

On some OnePlus phones there is also a thing called App Auto-Launch which essentially prevents apps working in the background. Please disable it for your app.Also try: Phone settings > Battery > Battery optimization and switch to the All apps list (Top menu) > Do It Later > Don’t optimize

Note: Some of our users indicated that you need to disable Doze mode in Developer options in 1+3 and earlier. Also disable Settings > Battery > Battery optimization > (three dots) > Enhanced optimization. This option may also be called Advanced optimisation.

XIAOMI

MIUI 10

To let your app run successfully in the background, make sure your settings look like the following (here for example is Sleep as Android):

Power management

Please enable:

Settings > Advanced Settings > Battery manager > Power plan is set to Performance
Device Settings > Advanced Settings > Battery Manager > Protected apps – Do It Later needs to be Protected
Device Settings > Apps > Do It Later > Battery > Power-intensive prompt and Keep running after screen off
Settings > Additional Settings > Battery & Performance > Manage apps’ battery usage and here:
1. Switch Power Saving Modes to Off
2. Choose the next options: Saving Power in The Background > Choose apps > select Do It Later > Background Settings > No restrictions

App battery saver

Security > Battery > App Battery Saver > Do It Later > No restriction

Autostart

Open Security app > Permissions > Auto-start Enable Autostart for Do It Later.

Meizu

Device Settings > Advanced Settings > Battery manager > Power plan set to Performance
Device Settings > Advanced Settings > Battery Manager > Protected apps – check Do It Later as Protected
Enable Device Settings > Apps > Do It Later > Battery > Power-intensive prompt and Keep running after screen off

Sony

Never use Stamina mode if you want your phone to do something useful when you are not actively using it.

Try to make your app not battery optimized in Phone settings > Battery > Three dots in the top right corner > Battery optimisation > Apps > Do It Later.

Samsung

Samsung S8 and later

Open the Settings > Device maintenance > Battery and at the bottom you’ll see a list of your most frequently used apps. You can manage apps individually or in a group by selecting them then tapping the big Save power button. Apps that are sleeping will appear in the Sleeping apps list at the bottom (tap it to expand the list). Scrolling further — all the way to the very bottom — and you’ll find Unmonitored apps. These are apps that you specifically want to exclude (white list) from App power monitor evil reach.

When inside the Unmonitored apps menu, you can tap the 3-dot menu to add or delete apps from the list. Rather than bothering with any of that, you can just turn off the App power monitor feature completely as it has little-to-no impact on battery life and only serves to handicap the normal functioning of your Galaxy phone.

It’s excessive and in some cases downright misleading, using scare tactics to keep you reliant on Samsung’s software when other Android devices get by just fine without it.

On other Samsung phones, the path may look like this:

Phone settings > Applications > select three dot menu (top right corner) > Special Access > Optimize Battery usage > Find Do It Later on the list and make sure that it is not selected.

Note: If you enable Edge Lighting for Do It Later, then the app will not be able to wake up your screen. To allow Do It Later to wake up your screen, please remove it from the Edge Ligthing applications list.

All Devices

Android P

There a special option in Settings > Apps > Do It Later > Advanced > Battery > Background restrictions. If users accidentally enable this option it will break their apps. And users do enable that option!

Pie and pre-Pie

Overall it is a good idea to make your app not battery optimized to ensure it gets the freedom it needs to perform in the background.

For that:

Go to Settings > Apps > Do It Later > Advanced > Battery > Battery optimization
Change view to All apps
Search for Do It Later
Choose Not optimized

Make sure Settings > Apps > Do It Later > Advanced > Battery > Background limitations is not enabled. If the app is not yet optimized for Oreo API level it will break their background processing.

If all fails you can turn doze mode completely off in Settings > Developer options. (If you don’t know how to enable developer options, Google should help.)