Edits in files don't get reflected in preview

Hm I am not sure about this. In a perfect world if the AI would be able to fix everything itself, I would agree.
But at the moment you sometime have to just adjust one line in the code yourself to fix something and go on, what the AI cant fix. I´ve got this many times and tried many prompts to tell it to fix it, but it doesnt.
The workaround then, if no prompt working, even with the correct solution, is to sync the files out, start a new chat and import the code with the fixed stuff again.

There is also this topic: Sync files to/from Bolt with `npx boltops guide` CLI

Did not try it yet, but this could maybe also work.