Glitching or did I miss something?

I just finished the main story of Ocean Horn 3. It’s been the first game in a very long time I want to 100%, or close as I possibly can.

However, the next main quest is talking to Dot. When I talk to him all he says is “Have you found the vault on High Rocks?” The problem is that I don’t have high rocks on my map. I tried sailing to the location based off of what I saw on videos and screen shots but no luck.

The bigger issue I’m running into is that no matter what I try or do the game won’t give me any quest but that one. I can start and finish side missions but I don’t get the flags for the areas I need to be in. I have to figure them out myself.

Is there a story element I missed to get high rocks?

I’m playing on iOS, I started it last week so the install is fairly new.