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That option has been removed from the Files tab
Inquiries about options for tabbing and copying files in team channels. That option has been removed from the Files tab. Some people have options. How do I move and copy files? And when someone w...
With the given information it sounds as if your org. has implemented app enforced restrictions https://docs.microsoft.com/en-us/sharepoint/app-enforced-restrictions
More detailed here https://docs.microsoft.com/en-us/sharepoint/control-access-from-unmanaged-devices
More detailed here https://docs.microsoft.com/en-us/sharepoint/control-access-from-unmanaged-devices