Yes to all of those comments – and also super helpful with keeping guides at the top of the artwork.

I would add that it would be ideal to be able to lock layers on top and in the background. Using the keyboard shortcut to send an element to the back of the pack also sends it behind the background.

Ideally, I'd like to be able to create 3 layers: a top layer (headers, footers, overlays, etc), a middle layer (content), and a bottom layer (background). Then be able to stack/order elements within those layers according to need.

This is an excellent request. I always spend time moving my fixed positioned layer to the top. Happens when I add new objects or elements to the page (those become the highest layer).

When switching to prototype to test, the new elements are above the "fixed elements".

I really felt the need to have this feature ever since it became possible to have fixed layer position when scrolling. As new layers get added, by default they get added to the top of the most recently active layer i believe.

It would be a tremendously good idea to have a fixed layer hierarchy position to make the fixed headers and overlaying components stay on top at all times.

I think it would be great is we could specify certain layers to always be top most in the stack. This would be really helpful for items that are selected for "Fix position when scrolling". For example the header is usually fixed and on top of everything. It would be great it I could make this topmost.

Now that we can fix layers for prototyping, it is important that those fixed layers, for elements like headers and footers, are on the top of the layer hierarchy when viewed as a prototype. Otherwise, elements appear on top of those elements as the prototype is scrolled.

Currently, every new shape is created at the top of this hierarchy. So, if a new object is made after the fixed elements have been defined, the user has to keep selecting those elements and moving them back to the top of the layer hierarchy.

It would be great to remove this necessity from the workflow by locking a layer to the top in someway, so that all new object created appear beneath it on the hierarchy.

Agree with Benni Asal, fixed elements is great feature, but would be much better if we could pin elements to the top. I find myself constantly pinning them manually to the top as go further in designing the screen, as new elements top the fixed elements.

I agree, to say it another way: By default any fixed object should always occupy the top z-index unless a user physically arranges a layer to be above the fixed object for a specific reason.

Generally the usage case for fixed elements is that they are to be above all other content on the page 95% of the time. So it is incorrect logic to make all newly created objects z-index to be above the fixed element in the layer stack.

I love the new feature to fix elements on the artboard. Unfortunately, there is no possibility to also fix/pin the layer.
This ends up in constantly moving the layer(s) up to keep the fixed element on top.

Seems like a separate request to be honest. The link for the feature you posted seems to deal with global document objects. This is simply requesting that an object or group of objects be pinned as the top most layer or layers to any artboard and any new object be placed under the pinned ones in the context of stacking order, global or non-global.