Time Warp in Sequencer in UEFN

[Green3dcg]

Summary

The TimeWarp feature in Sequencer cannot be used in UEFN. When I try to play using TimeWarp, I get the error “Disallowed reference to MovieScene.MovieSceneTimeWarpDecoration.” Is this a feature that is only available in UE5?

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

Please set up a sequencer to animate a skeletal mesh, apply TimeWarp to adjust its playback speed, and then play the map in Fortnite.

Expected Result

It will likely throw an error, and you won’t be able to play it.

Observed Result

アップロード中: スクリーンショット 2025-07-25 141101.png…
The following error occurs.

Platform(s)

UEFN

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[Max.Chen]

Thanks for the report. Time Warp in Sequencer should be allowed in UEFN. Unfortunately there was a bit of oversight here and it’s failing validation because the MovieSceneTimeWarpDecoration class wasn’t properly exposed. A fix has been submitted and should be coming out in 37.10. The bug report for this issue is FORT-942881 and we’ll update this post when the fix has made it into a release.

[Green3dcg]

I understand. Thank you for your quick response!