I want to know if I can do anything in umg like in flash/scaleform or umg is limited compared to flash/scaleform
That’s a very generic question. Short answer is no. You can’t easily deform drawings, as they are textures, for example.
The complete answer depends on what are you trying to do that you’d do on Flash/Scaleform.
No and i can tell you from fact that Slate (which powers UMG) is not as powerful as Flash which powers Scaleform, Flash was made primerly for animations (UI and scripting it’s extra feature), Slate was made to be primerly UI system. But you can do some motion graphics in UMG (it’s unique feature no UMG not part of Slate) not exactly sure how they are powerful as i never used them, they based on sequencer system, but still Flash is definitly more powerful and easier to work with in terms of animations.
From what i see in currently high class UE4 games Scaleform is still powerful enough to be relevant on market, for example Tekken 7 use Scaleform