Cannot connect external drive to PC

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Cannot connect external drive to PC

Operating system
  1. macOS
  2. Windows
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  2. iOS
Hi there :)

I use USB Copy to trigger a backup on an external SSD as soon it's plugged.

I needed to check what's on the SSD when I was on the go but when I plug it to my Mac I cannot see any files. Or it's not detected.

However when plugged to the NAS I can see them.

How come? There is a way to fix it?

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