I didn't get any options to convert to APFS when I installed High Sierra. I've opened disk utility and when clicked on my internal startup disk it is Mac OS extended,(journaled) go to edit menu and the option to convert to APFS is greyed out.
I've got a few external HD's and only 1 or 2 have the option to convert.
How do I convert internal HD and why can't all my external HD's be converted?
2016 Macbook Pro Touch Bar 15 2.7 i7,500gb, 16gb ram