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

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

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

1. We do not support fallback mechanism of Push Amp since the primary delivery service has high delivery rate of up to 75%-95%
2. Custom display (where notification display is handled by client app by passing key value pairs in 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 icon and large icon 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
• Customised notification channel: We do not support the out of box channels provided by Huawei. You can use your own custom channel or MoEngage default channel. But for HMS, in case of any incorrect setup, default channel will not work as Fallback the way it works for FCM. 
• Customising notification message icons
• Inbox style notification

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