When you are creating videos or other content the files can become quite large. Email services have a limitation on the size of attachments (usually 15-20MB although SMA allows 25MB). Schoology also has maximum file sizes that it will allow depending on what is being uploaded (100MB or 528MB).
So, when you want to share a large file(s) with someone the best method is to use your Microsoft OneDrive or Stream App/Account. Place the file or folder there and then you can share it with other students or teachers. Be sure to only share with "People in St. Mary's Academy" when creating the link.
For video sharing with people outside of SMA be sure to use the following settings.