In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, right-clicking on it, and selecting “View source” from the context menu.

For those unaware, if you tap on a basic text file from within Files by Google, the app only highlights the file's full name, download location, and the last time it was modified.

Google's file manager for Android is getting a power-user feature with built-in support for displaying basic text files.