How to use an ellipsis overflow with multiline Text in Flutter
In your example, the maximum lines is 3 but the text just show 2 lines of text. It means you dont provide enough height for maximum lines (like the height of it's container).
So you can provide more space for it or reduce maximum lines to 2 or place the text widget in Flex widgets (like ListView, ...)
You can test this one to see what i mean for
Container( height: 100, child: Text( "Last summer, I was working on a prototype for an AR app that would allow users to create virtual objects in real world spaces. I carried out the work using the Unity3D game engine. My last commit to the repository was five months ago.", maxLines: 3, overflow: TextOverflow.ellipsis, ), ),