Using Compression With UR 816C - How Are You Doing It?

I’m running a UR 816C into Cubase 10.5. I’ve been very satisfied overall using it for tracking and mixing but have a question about using compressor’s when tracking. As there are no insert jacks for any of the channels, how are you all using outboard (or other) compression when tracking, for example, vocals? Patchbay? Mic pre output → compressor input → UR816C? I know the DSPMixFX utility has channel strips with compressors, but do these perform compression before the A/D conversion? Looking for ideas on how to handle tracking with comps using the 816C.

Anyone using compression with this unit?

Nope, all processing is firmly in the digital domain.
As for the rest of your question, ask in the Cubase part of the forum and they will be able to help you quickly:)