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Continue to ChatRestrict SharePoint list item attachments by file type using a custom form https://michelcarlo.com/2021/05/08/restrict-sharepoint-list-attachments-by-file-type/
Restrict SharePoint list item attachments by file type using a custom form https://michelcarlo.com/2021/05/08/restrict-sharepoint-list-attachments-by-file-type/