Hi @Eiichiro Kazumori,
Did you mean the 100% of Parent used the enough size in OneDrive?
If yes, you are incorrect.
- The Documents folder is the synced folder from local.
- 100% of Parent is the size of folder that the proportion of the folder in the size that is currently in use. It's not related to the full size of OneDrive.
- % of Site Quota is the size you have used in OneDrive.
So you can still sync or upload files into Document folder, hope the information is helpful.
If my understanding is incorrect, please provide more information about your question and I'm glad to help you.
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