This article gives step by step details on how to share files outside of the company, using SharePoint. 

Please use this link to share files with external users: PTLG Share 

Make sure to add this site as a bookmark in your default browser and/or mobile devices. Instructions for each browser: Edge, Chrome, Firefox, iOS

I've included Microsoft training links to assist you in uploading and sharing these files with the necessary users.

SharePoint Sharing & Permissions: Share SharePoint files or folders - Microsoft Support 

Upload files and folders to SharePoint: Upload files and folders to a library - Microsoft Support 

First, go to: PTLG Share - Documents - All Documents