how can I share a folder from my one drive to specific people and block their ability to download files and folders from it
Please refer to the steps in "Share OneDrive files and folders" to realize sharing a folder from OneDrive to specific people.
Generally, the options you see may vary slightly between OneDrive and OneDrive for work or school, especially if your organization has restricted certain settings.
If you are using OneDrive for personal, maybe you cannot block their ability to download files and folders from it.
However, if you are using OneDrive for work or school, please refer to the OneDrive for work or school additional options part in the official document.
You could uncheck Allow editing. This can be further restricted by selecting the option to Block download.
"See who a file is shared with in OneDrive or SharePoint" may be helpful to you later, you could have a look.
Hope the information above could be helpful to you.
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