The best way to securely share information with coworkers or clients is to use a secure file-sharing service. Here are some steps you can take to protect your data:

1. Choose a trusted service: Research the different services available to determine which is the most reliable.
2. Set up 2-factor authentication: Enable 2-factor authentication to your account to ensure maximum security.
3. Limit user access: Remove any users who no longer need access to the shared documents and restrict access to only those who absolutely need it.
4. Control sharing options: Ensure documents are never shared publicly and always encrypted while stored or in transit.
5. Keep software and services up to date: Make sure the file-sharing service and any associated software are updated with the latest security patches.
6. Regularly scan for malware: Check shared documents for malicious software and malicious links