Monday allows you to search across boards. update, people, tags and files! However, if you have no control over file names, then the file search is not very helpful. It may be possible to change the file if you use desktop version through changing the file name then upload it, but when using phone, you will get this wired file names such as: “IMG_20200106_204936.jpg” , which it would be more helpful if the file name was “11091-contract.jpg”
The ability to change file names will allow you to find the right file fast, and makes your files easily located.