UE4 4.13.1 Flipbooks/Sprite Sheet Creation for UMG

I have been using Adobe AfterEffects to create some VFX to use in my game for UE4 4.13.1 on my game menu screens.

The way that I got it to work for UMG is by using a plugin I bought from the asset store. (I don’t know if there is a manual way to do this, if there is can someone let me know about how to have animated sprites on a UMG)

I have used the flipbook method and by using the plugin got my sprites to function on my menu screens.

The problem is the method to convert sprites to a sprite sheet for use with a flipbook in UE4.

Does anyone know of the best way of doing converting sprites to a spritesheet for hundreds of sprites? I tried TexturePacker (it sucks for multitudes of sprites)

The way I am doing it now, is just saving my sprites in layers via Photoshop and using a Photoshop Script for a SpriteSheet Maker to export it into UE4.

The problem is when I have a multitude of sprites. (Let’s say one high quality effect using Afftereffects is 299 sprites.)

Can someone provide me a resource for making a spritesheet with over 100 sprites efficiently?