Images in telegram notifications?

I’ve tried the telegram bot notification with image to an iOS 11 iphone, but I can’t get it to display a preview of the image with the notification. Anyone else have this problem? If not, can you share a screenshot and code snippet of your notification? Thank you

I assume you’re referring to the notification on the lock screen. I am able to send images to Telegram but it only shows in the app’s chat UI. The lock screen just shows " sent an image" in the lock screen notification.

I’d love to hear what is the best option for notifying to iOS, particularly notifying with images.