Hi Mark,

A little bit of context for why this happens... Keyframed properties that get added to the Essential Graphics Panel as a control, lose their animation on export to Mogrtland because the control can only represent 1 value at a time. Keyframed properties by nature have multiple values so it’s not technically possible for that 1 control to change values over time.
The control in PR can only tell Tiny Inception AE (nested inside Premiere Pro to make Mogrts work) “make this Opacity 60” ... it can’t tell Tiny Inception AE, “make the opacity go from 20 - 60 in 3 seconds from time 1 to time 4.”

A couple of ways that you can use as a sort of workaround is to use would be to use Responsive Design Time or create some time-related controls to give you the power to tweak the timing of your animations in PR.

There is a feature called Responsive Design - Time which allows you to change the overall timing of a Mogrt by creating Protected Regions at certain points in the Primary comp. If you want to be able to fine-tune the animation in Premiere, then setting the Protected Regions around the parts of the comp that are static will allow the timing to be squashed or stretched in the animated parts.
https://www.youtube.com/watch?v=b_mHxwJeAuY

Or if you want to be able to control the timing of certain elements in your Mogrt (i.e. hook up sliders to individual keyframes), then EC Abrams tutorial on using expressions for time is a must watch!
Control Time in Templates - Adobe After Effects tutorial
https://www.youtube.com/watch?v=i69oa0EeJ3A

Hope this helps!
Dacia

Has this been addressed yet? I can't find away to add keyframes to a slider in AE for my MOGT in Premiere

Keyframing in Premiere with the "Slider" control would REALLY be beneficial. For instance, a speaker in an education video says from 15-20% and animating a circle graph from the 15 to the 20 would be great instead of having to export the animation separately from AE each time I want to animate it. It defeats the purpose of making the percentage, the color, etc. editable in PPro if I still have to export each instance from AE.

It's the most annoying thing, I just assumed that it would work that any properties I added into my Mogrt, I added one slider, one point control, and one position control, and I spent quite a while in expressions getting these three controls to control the precise look of a template I wanted to animate dynamically against the dialogue in Premiere. Spending all that time to discover that I can't do anything in Premiere is REALLY frustrating. Nothing shows up as keyable (not even the position control) Now with my time left I have to decide between reengineering my set up, turning my whole PR sequence into an After Effects project, or sticking with a static sequence that does nothing I intended it to. I also wanted to use this in the future, as each video I reuse this template with will have different timings and different values. REALLY frustrating.

AE 16.0.1 Build 48
PR 13.0.3 Build 9

Hello James, thank you for your reply. However, animating keyframes would still be incredibly useful. I have a digital clock for example, which I made in AE. The time displayed is controlled by a slider and I would like to use it as a corner bug and adjust it right in Premiere to have the clock run through in the corner at the exact speed I desire - varying for clip to clip and project to project. I couldn't think of any other workaround than to export a 24-hr cycle as a video clip and time stretching it to my needs, but this is neither elegant nor applicable for all uses. So PLEASE make slider controls animatable in Premiere!!!

If you just want a lower third where the layer behind stretches or compresses based on the text layer above it, then you should consider using Graphic layers with Pinning in PrPro 12.0 or higher. That way you can animate the text layer's motion, pin the shape to it, and the shape will follow the text's animation and also adapt its size to the length/height of your text. That's a somewhat simplified method though. How exactly you pin it depends on how you want the pinned layer to behave.

To see how Responsive Design for Position ("pinning") works: https://www.youtube.com/watch?v=CPx_HmDXjgE -- try ~ 09:15

For Ae mogrts, transform properties like Scale, Position, and Rotation are now Supported Properties in Ae's EGP and can be adjusted in Pr's EGP. This is a new feature for Pr 12.1.