icloud imessage retention
Scenario - iPhone with 3 years of iMessages - I turn on Messages in iCloud on iPhone. They all sync up to iCloud.
I turn on Messages in iCloud on an iPad with the same account, they now have identical content.
Both iPad and iPhone have Message History set to "forever."
If i change Message History to one year on iPhone: does it purge messages up on iCloud? Will messages older than one year will delete on iPad?
If not - if I switch back to "forever" on iPhone - are messages older than one year downloaded?
Ideally, I'd like to know that if I adjust message history on individual devices it doesn't change what's up on iCloud..
Thanks in advance--
iPhone X