Any update on this as it was a 2017 request and I cannot imagine it's not a must for all Windows users? It's frustrating not to be able to add industry terms and company names to spellcheck.

I wonder if you could integrate Grammarly as a solution to this issue.

Any update on this? It's driving me crazy. The spell checker constantly underlines the name of our company as it considers it mis-spelt and there is nothing I can do about it!

I have noticed that this only affects me when I use my Windows computer. When I am on the Mac, it gives me the ability to add to the dictionary.

Yep, this is a must for serious users.