“To use Universal Clipboard, your devices must meet Continuity system requirements. They must also have Wi-Fi, Bluetooth, and Handoff turned on in System Preferences (on your Mac) and in Settings (on your iOS and iPadOS devices). You must be signed in with the same Apple ID on all your devices”
System requirements more or less means “hardware is new enough” (https://support.apple.com/en-us/HT204689; I think the technical reason is that it requires a specific Bluetooth version and macOS/iOS version)
Apple doesn’t say it, but I think the devices also must be on the same WiFi network and within Bluetooth range of each other.
Edit: as a consequence, if you lend your iPad to somebody for a few minutes while working on stuff you don’t want them to know about, log out of your Apple account. Without it, they can paste whatever happens to be on your clipboard.
Conversely, if you borrow someone else’s phone, don’t copy any secrets to the clipboard, even if you later replace that by something innocuous.
https://support.apple.com/guide/mac-help/copy-and-paste-betw...
“To use Universal Clipboard, your devices must meet Continuity system requirements. They must also have Wi-Fi, Bluetooth, and Handoff turned on in System Preferences (on your Mac) and in Settings (on your iOS and iPadOS devices). You must be signed in with the same Apple ID on all your devices”
System requirements more or less means “hardware is new enough” (https://support.apple.com/en-us/HT204689; I think the technical reason is that it requires a specific Bluetooth version and macOS/iOS version)
Apple doesn’t say it, but I think the devices also must be on the same WiFi network and within Bluetooth range of each other.
Edit: as a consequence, if you lend your iPad to somebody for a few minutes while working on stuff you don’t want them to know about, log out of your Apple account. Without it, they can paste whatever happens to be on your clipboard.
Conversely, if you borrow someone else’s phone, don’t copy any secrets to the clipboard, even if you later replace that by something innocuous.