Hi Megan
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
Make sure you’re signed in to OneDrive on your device.
Select the white or blue OneDrive cloud icon in the Windows taskbar notification area.
(You might need to click the Show hidden icons arrow The Show hidden icons button. next to the notification area to see the OneDrive icon. If the icon doesn't appear in the notification area, OneDrive might not be running. Select Start, type OneDrive in the search box, and then select OneDrive in the search results.)
Select More > Settings.
On the Settings tab, select the Save space and download files as you use them box.
Mark a file or folder for offline use or as online-only
Right-click a file or folder.
Select Always keep on this device or Free up space.
Also see for addition steps.