Web preview: your clips are read on this Mac; nothing is uploaded. Use Safari: it plays every Sony format, the same as the Lumina app. Open one shoot at a time and keep each clip’s .XML beside it.
This browser can’t play 10-bit H.264 (XAVC S-I, XAVC S 10-bit), the a7S III’s main formats. Open this page in Safari for those; XAVC HS and 8-bit clips work here.
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⌘2Skim
Drop a card, a folder or clips⌘OChoose…Read only.
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Your marksLumina saves your marks, not your clips. Open the clips again, all or some, and their marks come back.