If you’re the owner of a spreadsheet whose access is set to “Only invited people” or if the owner of a shared spreadsheet gives you permission to add people, you can invite more people to join the spreadsheet using their Apple Account.
Go to the Numbers app
on your iPad.
Do one of the following:
If the spreadsheet is open: Tap
in the toolbar, then tap Manage Shared Spreadsheet.
If the spreadsheet is closed: In the document manager or Files app, open the Numbers folder in iCloud Drive, tap Select in the top-right corner, tap the spreadsheet (a tick appears), then tap Share at the bottom of the screen.
Tap Share With More People, then choose a method for sending the invitation to collaborate:
Mail or Messages: Type an email address or phone number for each recipient, add a note if you want, then tap Send. A link to the file is sent to each recipient.
Invite with Link: Copy the file’s link, so you can send it or post it using any internet service that’s already set up on your device. Type an email address or phone number for each recipient, then tap Share Link. Open the app you want to use to share the link, tap where you want to paste it, then tap Paste.
Important: The link to the spreadsheet that’s created when you invite participants includes the spreadsheet’s title. If the title or content of the spreadsheet is confidential, make sure you ask recipients not to forward the link to anyone else.
Note: The link may appear in the body of the message as a stylised graphic with the spreadsheet title — make sure you don’t edit or delete it.
Any participant can copy a link to a spreadsheet and paste it somewhere else — for example, to save the link where they can easily access it. If the owner limited access to people they invite, the link only works for invited participants.
You can change the sharing settings for the new people after you send the link.