copy paste keyframes of multiple layers at the same time
in Ae, you can't copy/paste properties of different layers at the same time, it will intuitively duplicate your layers as a result.
you can do this using scripts:
https://aescripts.com/paste-multiple-keyframes/
https://conigs.com/tools/key-cloner/
this should be native.

4 comments
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Jari Hakala commented
I really miss copying multiple keyframes on multiple layers.
How about when selecting keyframes would copy/paste keyframes
... and selecting layers WITHOUT keyframes would copy/paste layers. Simple content-aware copy/paste function we have already in AE. -
Lasse Gjertsen commented
This will probably not happen until 15+ years, if ever, so in the mean time you should download this script:
https://aescripts.com/keyframe-presets/
You can copy/paste multiple keyframes from multiple layers,.
You can save selected keyframes into presets on a list.
This list can be exported and imported as a setting file.Bloody brilliant!
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Anonymous commented
It would be great you can simply hold down a modifier key to indicate that you want to past keyframes across multiple layers, as opposed to simply pasting layers.
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Roei Tzoref commented
*Edit: it will unintuitively duplicate your layers