Push Amp+ helps marketers to improve the delivery of their push notifications by up to 40% so that their message can reach more and more users.  As beneficial as it is, Push Amp+ also has certain limitations for its direct delivery service.

From an SDK point of view, Push Amp+ supports exists only for the below SDK from certain versions onwards: 

Here are the limitations for direct delivery service (and not applicable to fallback delivery service)

1. We do not support the fallback mechanism of Push Amp since the primary delivery service has a high delivery rate of up to 75%-95%
2. Custom display (where notification display is handled by the client app by passing key-value pairs in the payload or directly consuming MoEngage payload) is not supported for Push Amp+ enhanced delivery service.
3. Max length supported is:
   1. Xiaomi: Title 50 characters including spaces and max Message length of 128 characters including spaces
   2. Huawei: Title 40 characters including spaces and max Message length of 1024 characters including spaces
4. Huawei doesn't provide support for the notification image. However, small app icons and large icons are supported
5.  We do not support:

For Xiaomi

• Android Message summary
• Add Actions button (Default action is supported)
• Notification sound
• Local CDN image upload for Android notification. 

For Huawei

• Support for data payload
• Customized notification channel: We do not support the out-of-box channels provided by Huawei. You can use your custom channel or MoEngage default channel. But for HMS, in case of any incorrect setup, the default channel will not work as Fallback the way it works for FCM. 
• Customizing notification message icons
• Inbox style notification

6. Other limitations for direct delivery service (and not applicable to fallback delivery service)