According to your description, I have some questions as following.
Which type OneDrive are your using now?
Such as personal OneDrive (White OneDrive icon on taskbar) or OneDrive for Business (Blue OneDrive icon on taskbar).
> I'm trying to put it all back on my desktop as well on a ubs stick
Could you please tell us, how did you move data from OneDrive to Desktop folder or a USB stick?
I suggest you download the data from OneDrive Online to a USB stick directly to have a check.
(Please remember to temporarily change the download location of the browser to the USB external disk.)
Currently, are you syncing Desktop folder, Download and other folders from your local machine to OneDrive?
Please go to Account tab under OneDrive Settings interface, check which folders are selected to be synced.
Under Account tab, please also check the free space remaining on OneDrive.
Then it‘s recommended to check the remaining free space of the local disk.
Please go to OneDrive Online, and clean up the Recycle Bin of OneDrive.
Any updates, please let me know.
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