Symbol Nested Alignment
When you create a symbol it looses all alignment functionalities with elements that are nested within the symbol, it will only align to the external edges.
Example : I created a header, within the header there is a logo that is left align with a padding of 50px from the left edge. If i turn the header into a symbol and then create a thumbnail under it, it will no longer auto align to the logo only the edge of the header itself.
it makes it really hard to create pages with a symbol for the header when I can't align things to the inner nested elements.
Thanks for taking time to share your feedback. What you describe is not supported at this time.
I'd like to encourage you to submit a feature request here on User Voice and share with your XD network to add their votes!
XD Community Quality Manager