Other Connections (Box?) for File Search

Google Drive and Confluence are great, but the ability to support other storage solutions would be great. I have no idea how hard it is to make happen, but the ability to connect to Box folders or even OneDrive/Sharepoint folders would be a huge improvement for our ability to easily keep assistants up-to-date on the latest information without adding another step to the 'where do I put announcements and new info’ process.