# Keep Simulation changes not works

**URL:** <https://forums.unrealengine.com/t/keep-simulation-changes-not-works/1086001>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine, editor, question\
**Created:** [April 17, 2023, 12:22pm UTC](https://forums.unrealengine.com/t/keep-simulation-changes-not-works/1086001 "2023-04-17T12:22:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![KetherGame](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/kethergame/32/912204_2.png) [@KetherGame](https://forums.unrealengine.com/u/KetherGame)\
**Post date:** [April 17, 2023, 12:22pm UTC](https://forums.unrealengine.com/t/keep-simulation-changes-not-works/1086001/1 "2023-04-17T12:22:35Z")

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Always show “no properties were copied” error.  
Why?  
UE 5.1.1

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**Author:** ![Astrotronic](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/astrotronic/32/1194566_2.png) [@Astrotronic](https://forums.unrealengine.com/u/Astrotronic)\
**Post date:** [April 17, 2023, 2:17pm UTC](https://forums.unrealengine.com/t/keep-simulation-changes-not-works/1086001/2 "2023-04-17T14:17:19Z")

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Hi Kether,

Do you have the meshes that you want to update selected when pressing K?

Maybe there is some info in the [docs](https://docs.unrealengine.com/4.26/en-US/BuildingWorlds/LevelEditor/InEditorTesting/KeepSimulationChanges/) page for this feature that will help you.

I just tested this and everything is working as expected.

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<div class="post-metadata">

**Author:** ![KetherGame](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/kethergame/32/912204_2.png) [@KetherGame](https://forums.unrealengine.com/u/KetherGame)\
**Post date:** [April 18, 2023, 5:15am UTC](https://forums.unrealengine.com/t/keep-simulation-changes-not-works/1086001/3 "2023-04-18T05:15:20Z")

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Please try: A BP actor with a static mesh as root, set the static mesh simulate physics enable. Then keep its change in simulate mode.

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<div class="post-metadata">

**Author:** ![Astrotronic](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/astrotronic/32/1194566_2.png) [@Astrotronic](https://forums.unrealengine.com/u/Astrotronic)\
**Post date:** [April 21, 2023, 1:25pm UTC](https://forums.unrealengine.com/t/keep-simulation-changes-not-works/1086001/4 "2023-04-21T13:25:46Z")

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Hi @KetherGame,

I see what you’re saying. It looks to be a [longstanding issue](https://forums.unrealengine.com/t/keep-simulation-changes-with-custom-class/333955). I just tried the workaround mentioned in that thread (Simulate, Select actors, Copy, End Simulate, Paste, Delete originals) and it seemed to work ok.

Hope that helps!