That is correct – this is a feature that we are likely going to add soon. Please see the list of supported cameras and features here: https://owlr.uservoice.com/knowledgebase/articles/458563-supported-cameras-for-owlr-apps.
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Please add this feature for the Foscam R2 series. I prefer using the Owlr app, but I will switch if PTZ is not supported. Thanks.