Fixed vs Scroll layers - Issue in the order

Hello, team:

I am trying to create a template using several items. The action I need is as follows:

  • Upon scrolling, I wish to have ONE Fixed layer to he hidden upon moving the rest of the layers.
  • Currently, FIGMA allows m to do so, but it positions all FIXED layers on top of the scrollable layers.
  • I need my layer to be right under ONE scrollable layer and upon scrolling show up.

See screenshots. Any ideas?