I’m using an interface with 8 analog inputs and 8 channels of ADAT inputs with Logic Express and I can’t choose all of the ADAT inputs.

Logic Express has a 12 input limit.

You will only have access to the FIRST 12 inputs on the interface, as presented to Logic Express by the interface’s drivers.

For Instance:

On an interface that has 8 analog and 8 ADAT channels, only 4 of the 8 ADAT channels will be available in Logic Express. If the interface allows you to disable the analog inputs, all 8 channels of ADAT input would be available. Some interface drivers will allow you to disable particular inputs, but this is rare.

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