Which method is NOT typically used by web designers when dealing with HTML files?

The process of web design generally involves several methods for editing and managing HTML files. The approach of uploading from a mobile application is not a common or standard practice because mobile applications typically do not provide the same robust capabilities and environments for editing HTML files as desktop environments do.

Web designers usually prefer to work within a text editor on a desktop or laptop, where they can utilize more advanced features like syntax highlighting, code completion, and error detection. Editing directly on a web server can be done, particularly for quick changes, but is not ideal for larger updates or more complex designs, as it can lead to mistakes without the safety net of local backups. Downloading HTML files to a personal computer is also a standard method that allows for extensive modifications using powerful software tools.

Thus, uploading from a mobile application does not align with the typical workflows of web designers, making it the least common method among the options provided.