For process documentation (eg, not code docs), we use a company shared Google Drive folder with subfolders broken down by department (sales, marketing, support,

For process documentation (eg, not code docs), we use a company shared Google Drive folder with subfolders broken down by department (sales, marketing, support, finance, general management, hr, etc) and within each we have documents and checklists that serve as both documentation and quality controls for our most critical business processes. We have videos, slides, spreadsheets, docs - we always try to use the best format for the job. It's not perfect but you're right in that it has a huge impact on the efficiency of certain processes and therefore, scalability.