How to format an external SSD to APFS?

Question

Hi, Dropbox Community.
I want to move all my Dropbox folders and files to a new external SSD attached to my MacBook Pro (High Sierra 10.13.6).
I had to use the “Disk Utility” on my Mac to erase the format type “MacOS Extended (Journaled)” because of the error “Unsupported File System.”
Erase was successful.
But, now I’m stuck. 
How do I format the external SSD to APFS? What are the steps?
Thank you for your kind attention. 
I look forward to hearing from you.

Hannah · Accepted Answer

Hey @Jan Sobieski, thanks for posting your question.

This is more of an Apple related question, to be honest, but I've looked online and found this and this article.

I hope they help, but if not, I'd suggest reaching out to Apple for more info.

Cheers!