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Live2D Cubism
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[Regarding macOS Tahoe](Updated October 16, 2025)
macOS v26 Tahoe is now supported!
We advise against upgrading your macOS at this time as it may cause Live2D products not to function correctly.
Upgrading macOS can also cause you to lose your Cubism Editor license file.
Please make sure to deactivate your Cubism Editor license before upgrading the macOS.
For more details:
https://help.live2d.com/en/other/other_09/
For inquiries regarding issues with license purchases or license activation errors, please contact us through the email form.

Comments
Here is the Live2D staff.
Thank you for your interest in our product.
Please see this manual page.
https://docs.live2d.com/cubism-editor-manual/mesh-edit/?locale=en_us
Best regards.
The add button is meant to add a new mesh generation preset. Not so much to add a new mesh.
If you are trying to redo the mesh you already created for the hair, you need to select one of the preexisting presets from the drop down menu again (light, standard, or heavy).
Might I suggest to also separate each hair strand/piece to about 7 different parts.