Question about microsd card for Herobook pro

Hi, I have questions about microsd cards for the herobook pro?

1: Is it OK to get a microsd card with more than 516gb (The maximum storage
amount)?

2: How can I share/merge the storage of the microsd card with the storage built with the laptop?

3: How can I be able to tell which microsd card is for a laptop (Everytime on amazon, I never see the card listed for laptop)?

  1. Only supports 128GB
  2. Is not possible, they will appear in separate folders.
  3. Any card would be ok, while it can be inserted