Hello Amkzul,
I may have a solution for you. Have you tried making multiple images and changing the Zorder? Here is an example:
All I did was set it up so that the tab in this case will fire off the custom event “ChangeZ”. It is casting from my character blueprint to my widget blueprint.
Here you will need to have to have two images of the exact same size and in the exact same spot in your designer graph. All this widget blueprint does is determine which image is on top. This will effectively hide the bottom image making it look like the image is changing. Just think of it as stacking them into a pile.
This of course is a very simple example but I hope it helps.
Make it a great day