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Share two OneDrive accounts
Every account you create in OneDrive gets a minimum of 7 GB of online storage. Your main account is the only one you can sync to a PC, Mac, or tablet, but you can still access other accounts.
If you have a second Outlook.com or Hotmail address, open a web browser (ideally in private/incognito mode) and sign in at Onedrive.com using that account. Create a new folder or use one of the standard folders, then right-click that folder and choose Share. Use the Invite People link to create a link using the address associated with your main OneDrive account.
Click the Recipients Can Only View link at the bottom of the Invite window to change the settings: You want to allow yourself to edit files in that folder, and for security reasons you also want to require that you sign in with your Microsoft account.
When you're done, send the link to yourself. You can now access files from that secondary account by going to OneDrive in a web browser, signing in with your main account, and clicking the Shared link in the pane on the left.
Add a cover image to any folder
Normally, when you open OneDrive in a web browser and choose Thumbnails view, each folder cycles through different images from that folder.
For some folders, you might want to choose a specific cover image that identifies that folder easily and never changes. To do so, open the folder, find the image, right-click, and choose Add As Cover from the menu. Done.