How to Copy/Paste layer mask in Photoshop for iPad?

Can anyone tell me how to copy a layer mask from one layer to another? I assume this is possible as there is a "Copy Mask" option in the 3-dot menu but creating an adjustment layer and going back into the menu shows "Paste" which pastes a copy of the entire original layer.

Any help would be appreciated.

Edit: I just ran across this:

"By default, a layer or group is linked to its layer mask. To break the link between a layer and a mask, tap (icon).This allows you to move the layer image and the mask independent of one another." but the functionality is the same whether the layer and mask are linked or not.

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