If you want to save every screenshot you take using Print Screen key to your OneDrive folder so they get synced up automatically, here is a quick tip for you.
Go to the system tray, right-click on OneDrive icon and choose Settings to open OneDrive Settings dialog box.
Then, switch to Auto Save tab, and check the option “Automatically save screenshots I captured to OneDrive.”
Click OK to save the setting. OneDrive will now take over and register any keyboard combinations that involve Print Screen key, Alt + PrintScr, Ctrl + PrintScr, etc.
Now from this point on, every time you press Print Screen key on your computer a screenshot of your whole desktop will be saved in the following folder in your OneDrive and gets synced up to the cloud automatically. Pressing Alt + Print Screen keyboard shortcut will save the screenshot of the currently active window instead.
OneDrive > Pictures > Screenshots
Note that Win + Print Screen key combination still works the same way and will still save a screenshot of entire desktop to the Screenshots folder under Pictures folder in your local user profile.