No backward compatibility for older devices – Numbers Review

Updated Numbers changes the format of spreadsheets so they can no longer be edited with older versions of Numbers. First it was an older Mac running a no longer supported MacOS, now it’s my iPhone 6 which is stuck on iOS 12. I have a spreadsheet I’ve had for a long time and like to be able to update from any device. It’s very simple, doesn’t need any of the new features. But I can’t edit it any more from the iPhone; if I make a copy for the iPhone, I won’t be able to edit it on the iPad. If the new version gave the option to update the file, or to “save in old format” that would be fine. I could go to Google Sheets but prefer Numbers because of it’s security.
Review by RGEarley on Numbers.