If QA is using the UX design documents to verify the application then it is important that the UX design documents are updated, the changes are highlighted, and

If QA is using the UX design documents to verify the application then it is important that the UX design documents are updated, the changes are highlighted, and the changes are then assigned to a jira ticket. You can break the changes into per screen/page/section tickets but until all of the changes have been verified by QA the work isn't done. If you're talking about "move this over by 1 pixel and then change this color by x in red and this should be an em dash" changes, it can be faster to work side by side with someone. Remotely this is harder. You noted "multiple features" -- is this an issue where the design style from UX hasn't been implemented as a style for reuse across all of the application or the implementation of the style is beating against the specific layouts for different features?