Problem: I wanted to make things Instantly Appear, so I did it manually Setting Opacity to 0 then 100, one by one. (Which was very time consuming BTW) So I started thinking and developed this method
Solution: To the Visible Image Slot add a Blank PNG, Then You would have a Visible Image and an Invisible one. And That's All it will help you switch and animate between them easily.
Also Quick Tips
Image Appear: In set-up Mode set the slot to Invisible Image, Then in Animation Mode pick the frame you want it to appear and set it to the Visible Image. Then Just Like that Your Done
Image Disappear: In Set-up Mode set the Slot to Visible Image, Then in Animation Mode pick the frame you want and set the slot to the Invisible Image.
Blinking: It will require to switch Manually between your images but like I said it saves you a lot of time.
Fade: You'll have to manually animate the opacity
Anyway if this tutorial Help you feel free to let me know ^^
Also if you have other easier ways of doing it Pls let me know, I did searched if anyone knew how to do this but no one talked about a blank PNG so I made this post just in case!
This is what I was trying to make as an example