How can I share a safe with another person?

You can share your safe using iCloud Drive:

• Open the Files app.
• Tap the "Browse" section to the bottom.
• Open pwSafe's folder in iCloud Drive. You might need to go back to find it.
• Long-press your safe. If there's more than one safe with the same name, choose the one with pwSafe's logo and the .psafe3 ending. Please note that long pressing should be done lightly, without triggering force-touch.
• Select Share from the menu, then choose if you want to collaborate or send a copy of the folder or file.
• Tap Share Options, tap "Only invited people" tap "Can make changes", then choose a method—such as Messages or Mail—for sending people a link to the safe.
• Ask the recipient to open the message or email using an iOS device and tap the sharing link.
• Your safe will now be available inside the recipient's iCloud Drive. Ask the recipient to open the Files app and move the safe to the "iCloud Drive / pwSafe" folder. That will make the safe appear inside the pwSafe app on all Apple devices of the recipient.
• Done, pwSafe will now show the same safe for you and your sharing partner.

More detailed instructions are available on Apple's support site for iPhone and Mac.

You can also accomplish that using Dropbox and their shared folders feature:

• Dropbox shared folders
• How to sync with Dropbox.