How to mask each parts of subject in LR Mobile ?

[Chan.Tee]

I'm new for LR mobile. just subscription.

Last week, I use LR Mobile "Select Subject" in Masking feature and get separate mask of each part (such as teeth, eye, lip etc.) in masking result.

But today, when I use this feature, both iOS and Android (both .jpg and raw), I just get a one mask of the whole subject.

Now, so confuse.

What I do wrong in setting ? or

Is there this feature in LR mobile ?

[Charlie.D]

Please see this page for how to use Masking: https://helpx.adobe.com/lightroom-cc/using/masking-mobile-ios.html 

[dmandl]

This does not answer the question. I had the same question. I can do this fine in Lightroom Classic, I guess to do it I have manually with brush. Very lame. This method of masking was really great for teeth whitening & doing a quick face soften, etc.