Hi Kevin Law,
Good day! Welcome to Q&A forum.
Please help to collect the following information to further troubleshoot the issue:
- Do you mean you are unable to upload files to SharePoint library? Please describe your issue in more details.
- Are you getting any error? Is so, please provide us with the screenshot.
- Whether you are working with SharePoint online or SharePoint on premise?
- Whether you can upload files to other libraries?
- Whether all users cannot upload the files?
Hope these information helps.
Please do let us know if you have any further queries.
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