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While doing the work for the channel settings modal, it would be nice to also update the notification preferences modal for the channel. This is just a UI update, so if it can be squeezed in, that would be great. 
Not an imperative though as we can use the current modal for the interim
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Future Updates
The updates above will help pave the way to allow for proper bookmarks/links functionality in the header - rather than relying on markdown formatting. TBD
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