How do Markers and Keyframes modes work?

Some of our animations have the option of customizing them using a unique panel inside the bottom of the Pack Manager.

With this panel, you can easily and quickly adjust the speed of the animation IN and OUT
using Markers Mode image or Keyfremes Mode image

Markers Mode is selected by default, add animation with it, and then move the markers to your desired position to adjust the IN/OUT animation speed.
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Select Keyframes Mode, and then use it to add animations. Press “U” and adjust the keyframes as you want.
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Markers Mode allows you to customize your animation more flexibly.

For a better understanding, please see the video AEJuice Animations Presets keyframes stopped working - YouTube

You can find more complete articles on Keyframes here.