1. Unreal Engine 4 Animation Slot Free Play
2. Unreal Engine 4 Animation Slot
3. Unreal Engine 4 Animation Slot Machine

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2. In this video I'm going to show you how to animate characters inside unreal engine 4.Looking to get started in unreal engine 4? Check out this video:https://.
3. Note: A slot is often used for layers but can also override what the Animation BP is currently playing with an Anim Montage. To activate the slot and play the Anim montage with any anim check the doc for 'Play Slot Animation As Dynamic Montage' which basically temporarily treats any animation as a montage.

When I discovered Unreal Engine 4 I was blown away by it's realistic real-time rendering engine! I immediately saw that Unreal Engine (UE4) was a game changer and that it had now become possible for a small studio consisting of a few artists to pull off a Hollywood quality feature length animated film! What I did is create 1 animation for each, but have both hands performing the exact same motions. I then use Layered blend per bone node to blend an Animation Blend for the characters leg Movement and 2 Animation Blends I used for my arms (one for left, one for right, both starting at a joint near my characters clavicles.).

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Last time we added a sword equip and sheath functions to our character. But these animations are played as if the character is standing still. But, we need our character to be able to equip and sheath sword while moving as well. In this episode, i’ll show you how to make these animations independent from the stance or movement of the character. For this i’ll use unreal layered animation system with animation slots.
source

This might be a little late but for posterity's sake I figured I would answer this question.

PlaySlotAnimation() and PlaySlotAnimationAsDynamicMontage() are a bit strange because the Asset parameter is of the UAnimSequenceBase class, but the function name suggests that you pass it an animation montage (UAnimMontage) and it plays a slot in that montage. When in reality what actually happens is that the function is expecting an animation sequence to use to create an animation montage, and the slot name you pass it is the slot name in the new dynamically generated montage. In fact the first check in the code is to see that it is NOT an animation montage:

So if you pass in an animation montage, the asset will always be marked as NOT valid and the function will exit.

In other words, you can't use PlaySlotAnimation() or PlaySlotAnimationAsDynamicMontage() to play a slot in an animation montage that already exists. You'll just have to create multiple animation montages and use MontagePlay() to play them.

Unreal Engine 4 Animation Slot Free Play

This is a bit of a strange design decision, if someone from Epic could clarify as to why there is not a function to play an animation from an existing montage that would be awesome; maybe I just missed it? The function naming is poor though IMO, something like PlayDynamicMontage() may have been better. I would be interested to hear someone else's thoughts though.

Unreal Engine 4 Animation Slot

Unreal Engine 4 Animation Slot Machine

(Referencing code at ea7b5e4da1ca360c4800fc11f1125c3c38f68f12, which is on the 4.19 branch)