Additional SD-Card using first time

Hello, I used an SD card for the first time.
Now I get the choice to use “As portable storage”
or “For storage expansion”. But this with a big warning:
This Option may not work properly or lead to data loss and is therefore not recommend”

Can someone explain me the technical background?
Why note recommend? …

Read this:

And think carefully about whether you really want to use the card as storage expansion

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