You can store sensitive files in OneDrive using Personal Vault. Here's how.

[Windows Central]

If you have sensitive files you want to store in OneDrive, then you want to use Personal Vault to keep more secure, and here's how.
In OneDrive, Personal Vault is a feature designed to offer a protected area within your cloud account to store your more important files (such as sensitive documents, personal records, pictures, and virtually any file you want), using stronger security with two-factor authentication like fingerprint, face recognition, PIN, as well as email or phone code, in addition to the typical sign-in process to access OneDrive.

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