If you are wondering, what is the proper response if spillage occurs then the best answer is to inform your security POC. To prevent spillage, all files should have classifications and handling methods. Giving headers, marking of classifications, and labeling of files can help stop spillage.
What is Security POC?
POC means Proof of Concept. It is a demonstration of a method that really works in the security of any software.
Also read: What is required for an individual to access classified data