A civil servant working for the European External Action Service (EEAS) needs to share a sensitive diplomatic document with a colleague in a different EU delegation. The document contains personal data of EU citizens. The colleague requests to receive the file via a personal, free-tier cloud storage account to ensure immediate access. Based on EU digital principles and the role of the EEAS in coordinating international action, what is the most appropriate course of action regarding the use of personal cloud services for official sensitive data?