Hi,
Please try these methods and confirm if it will help:
Check if files have been moved or renamed: Sometimes files may be accidentally moved to other folders or renamed. You can try searching for a file name or part of it in OneDrive.
Check the OneDrive Recycle Bin: Even if you didn't delete a file, it could be accidentally deleted and moved to the Recycle Bin. You can see if the file is available in the Recycle Bin in OneDrive.
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