This search dialog is quite powerful. You can search for any text inside file notes as well as in Kanban cards (only in those groups you are a member of) Kanban card search is case insensitive. However, the search in file notes is case-sensitive
Git Winch does NOT search INSIDE file contents. The reason is that Git Winch is file-agnostic. Which means, it has no say in what kind of files your office would be working on. This gives all offices using Git Winch tremendous flexibility. But the downside is that we cannot possibly implement search within files, as there can be just too many different types.
If you do want to search within files, we have a few recommendations. Most are free but some require you to pay a small amount. Note that we do not have affiliations with any of them, so we cannot take responsibility for their functioning: