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The wiki can house and serve files but it is not the most efficient file repository. For example, if you need to serve fifteen or so files to a committee but don't need information organized onto web pages arranged into a particular hierarchy, a shared Google Drive folder or Team Drive is probably better. There is obvious overlap between the two systems, the wiki and Google Drive. For sharing files in teams of staff or faculty, Google Drive is probably more efficient, since it's just easier to manipulate files there once the sharing rights have been established. If you are not publishing to a larger community, the wiki might be as much or more work, as far as securing your information.
Neither ITS nor COLI recommend using D2L as a general web-based content management system. This practice has survived from over a decade ago, when D2L's predecessor was so used in the absence of alternatives. Because it is designed for course content exclusively, using D2L simply to share files or information means a few more clicks for each operation, and frustration when limitations are reached. For example, sharing with a large group of people can only be done through manual enrollment by the space owner (not ITS or COLI), and involves many more steps than the Wiki or Google Drive.