XenForo how to hide the Attach files button on Post thread page but retain its function (which is also used by Drop image)?

[gogo]

For some nodes I would like users to be able to upload images only, but the Attach files button include too many file types. So I would like to let them upload images by using the Drop image menu only. I tried to remove the Attach files button from message.macro but the Drop image menu will also be gone.

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