Custom formats not editable from older sheet
Hi, so I have this sheet I made back a couple years ago where I track my budget, and I added a couple of custom formats to it, but after I upgraded to Numbers 4.0, format editing is greyed out, and in fact, I can't seem to be able to create new custom formats at all in this sheet.
What's going on? How do I make this compatible?
This is a custom format I made:
This is an attempt to create a new custom format
Totally unavailable. I can use them, but can't make new ones or edit them. I also tried iCloud, and numbers for iOS. Same issue.
Any suggestions appreciated!
macOS Sierra (10.12.1)