Managers can share files with members in two ways. First, by uploading files to the Files (or Featured Resources) section in each group, members will need to upload a file to the Resource Center prior. And second, by attaching files to messages while noting files uploaded From Drive have a 25MB limit, due to email constraints.
Files Stored in the Group's File Section
Click the Upload File icon, select From Resources, choose the file, and click the Add button.
To attach files from your computer, click on the Upload File icon, select From Drive, then either drag and drop the file or click the box to choose the file.
To attach multiple files from your computer, hold down the Command⌘ (Mac) or Control (PC) key and select the files to upload.