Here we summarize several useful fixes to this issue.
And, the solutions below are suitable for OneDrive shows folders but not files as well.
How to Fix OneDrive Files Not Showing Up Online
Solution 1.

This is the easiest way to troubleshoot the OneDrive files not showing issues.
Right-click theOneDrive iconon the taskbar and click thegear iconlocated in the upper right corner.
Then selectSettingsfrom the drop-down menu.
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Move on to theAccounttab, and clickUnlink this PC.
In the pop-up window, clickUnlink account.
After that, you should probably reconnect your PC and see if the online files are back.

Facing the OneDrive there was a problem signing you in error in Windows 11/10?
Find effective solutions from this post.
After that, check whether all your OneDrive files are displayed.
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Solution 3.
In this situation, you’re gonna wanna free up disk space.
For this purpose, you might execute the Disk Cleanup tool.

Open Disk Cleanupby using the Windows search box.
grab the drive you want to free up space on.
Wait for a while, then choose the files you want to delete.

After that, clickOK.
Here this article may be helpful:What Is Safe to Delete in Disk Cleanup.
Top Recommendation
If you mistakenly delete some important files by using Disk Cleanup, do not worry.
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you’re free to use MiniTool Power Data Recovery torecover deleted files.
Read this post to see how to find or recover your screenshots and fix the issue.
Solution 4.
Reset OneDrive
Step 1.
Press theWindows + Rkeyboard shortcut to launch the Run window.
Step 2. throw in%localappdata%\Microsoft\OneDrive\onedrive.exe /resetand pressEnter.
Just press theWindows + Ikey combination to open parameters.
In the prefs window, selectUpdate & Security.
In theWindows Updatesection, clickCheck for updatesand then follow the on-screen instructions to complete the installation.
Solution 6.
Choose Another File Sync Tool
In addition to OneDrive, there are many other professional and reliable file-syncing tools.
Here MiniTool ShadowMaker is highly recommended.
Its clear and concise interfaces make data backup and file sync easy to complete.
you’ve got the option to nudge the button below to download it and have a try.
Conclusion
If your OneDrive files not showing on another computer, try the ways listed above.
Or you’ve got the option to change to another file sync tool such as MiniTool ShadowMaker.