A Microsoft file hosting and synchronization service.
Hello RobE-7525
Thank you for posting question to Microsoft Q&A Forum.
Please review the explanation from Q&A Assist. I would like to emphasize step 2 and 4 from its suggestion, and also additionally I also provide this article for you:
https://support.microsoft.com/en-us/office/save-disk-space-with-onedrive-files-on-demand-for-windows-0e6860d3-d9f3-4971-b321-7092438fb38e
The idea is that after you move your files (Word, Excel and pics) into OneDrive, they will be marked with fully green icons like the screenshot I've provided above - which means the files are already uploaded to the cloud, you could right click on that file and select "Free up" space option - this will keep the file to be on the cloud only and save storage for you.
Please let me know if you have any further quesitons. I hope this information is helpful.
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