File Explorer Sync: Sync files with OneDrive ‘on’ (green tick notification) and ‘Files On-Demand’ unchecked for offline access. See OneDrive ‘Settings’ in Notification Area
File Explorer Cloud storage: View OneDrive storage in browser to see where files are stored remotely (www.onedrive.com)
File Explorer: Sync files to other other cloud storage e.g. Dropbox – check settings and view online

Windows Photos app: OneDrive view online, edit and share photo files