I created a Numbers spreadsheet and saved it to iCloud with a password. I want to share it with 2 other people and allow them to make simple changes to the spreadsheet. 1. Do they need to log in to iCloud to make changes to the spreadsheet that I shared? 2. How do they save their changes after making them? I just checked the link created when sharing the spreadsheet and I didn't see a save button in the browser. 3. Which browsers will others be able to view/edit the spreadsheet in? Will it also work on PC? Thanks!