Multiple people working on a cloud xd document usability issue

When multiple people are working on the same document and person A saves:
Person B has 2 choices:
1) Accept Changes and lose all changes he's done.

2) Save his changes into a new document localy, creating an out of date version that won't be updated.

Suggestion: 
When prompted to "Accepted Changes" or "Save Locally" can you make xd NOT lock out the user from copying stuff on the artboards? 
Let users migrate unsaved changed through copy paste clipboard.