Hello,
I fixed my header and footer and their components are both in separate folders, when I try to preview my prototype and scroll only the fixed header shows up on the top menu when scrolling. The footer is not showing up at all. Any idea why? Both are set to fix when scrolling. Thank you in advance!
Gleb,
Thank you so much for explaining that to me. 
You were right my Y was close to 1500 on that bottom footer frame folder, the question I have, for long scrolling frames, is there a way to have a fixed footer placed that will be within the constraints?
Note: I’m at my beginner and just started using Figma.
Solution:
I actually worked on it until I found a solution after fixing the constraints you suggested to bottom but the footer still wasn’t showing up when I tested my prototype.
So, I figured that it must be an issue with one of the components within the folder. What happens was one of the components within the footer folder was not set to to vertical scrolling. You can check this by:
-selecting the main component that you used to create the instance from.
-Enter prototype mode
-under the overflow scrolling menu if it says no scrolling, change that to vertical or horizontal scrolling.
If the primary component is not set to scrolling then it won’t appear when you check the “Fix position when scrolling box” under the constraints menu when in design mode.
Hope this helps anyone who is having trouble with this.
You just needed to set constraints to “Bottom”. Your solution makes zero sense to be honest, I think you might have accidentally changed constraints to the right setting in the process and didn’t notice so you think your long list of useless (as far as I understand) actions worked. 
Great! I’m happy it worked and that’s all that matters to me.
Hope you have a great evening!