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Hello,
You are most likely signed into a different OneDrive account on the Mac than the one you are checking on the web, or the Mac app got out of sync. The fix is to unlink OneDrive on the Mac and link it back to the exact same account you see on the web.
Start by opening OneDrive in your browser and look at the email shown in the top right. Keep that email handy. On the Mac, click the OneDrive cloud icon in the menu bar near the clock, choose Settings > Preferences > Account > Unlink this Mac. The OneDrive window will switch to a sign in screen. Sign in again using the exact same email you saw on the web. When it asks where to store your OneDrive folder, accept the suggested location.
If it notices an existing OneDrive folder, choose the option to use this location so it reconnects rather than creating a second folder. Finish the setup and wait. Click the cloud icon again and watch the status. You want it to say Up to date. Do not move the OneDrive folder manually while it is syncing. When the status shows Up to date, refresh OneDrive on the web and your recent files should appear.
If anything in those screens looks different or you still do not see the files on the web after it says Up to date, tell me the email shown on the Account tab and the exact status line you see under the cloud icon, and I will guide you from there.