Unify mask position

There are many thing in Photoshop I do not know exist I may even have seen the unify icon you show but it never registered in my brain. I see a link icon under the pin icon.  So it the thing you show is a button I have never used it.  However, I have use layer masks creating animated gif and  use the layer mask link icon to un-link the mask with the layers content.  So the mask would be applied to the frame while Photoshop moved  the layers content in the gif frames composite.  Here a create two layers and Mask the upper layer for the lower layer content.  So I did not want the layer mask to be relative to the current layers content rather I wanted it to be relative to the lower layer content.  That may seem strange to .   I wanted to be able to move the layers content and have Photoshop mask the content to merge with the lower content the way I wanted it to be composited.  I use the Create frame animation button to create the frame animation panel and the first frame.  I created a second frame and moved the upper layer content position in that frame. I then used Photoshop Tween feature to generate frame between the two frame I had.  I do not know it this has any bearing on what  your writing the LINK icon made me write this.

Here is what I did.