keylight : How to make matte information in to alpha channel?

Inorder to decrease my cpu comsumption i decided to export my keyed footages as .tiff sequence with the alpha channel

( which coming from Keying matte + Rotopaint matte)

But i cant find the way to make the ‘Keyed’ information
(from Keylight node) to the alphachannel .

can someone help me how to Copy Keying Matte information into Alpha channel.:confused:

THe composition result look fine.

but in the Alpha channel its all dark.

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