Yes! Custom Fields are fully supported by Mirror. A few steps to complete before we can start syncing.
Step 1: Enable the Custom Fields Power-Up
The Power Up needs to be enabled on all boards that you are mirroring cards to and from.
Once you've enabled that, you'll notice that all of your cards will now have a 'Custom Fields' option on the right-hand side.
Step 2: Create your custom fields
Make sure you create them on the origin and destination board/s. For Mirror to match up your custom fields, make sure the titles and fields are named exactly the same on all your boards.
Step 3. Make sure you have enabled Custom Fields in your Mirror settings.
Mirror will sync Custom Fields by default. See below on how to check to ensure it’s enabled: