replit.nix and .replit files are hidden for nix repls
None of the configuration files for nix (replit.nix and .replit) show up on the file browser for nix. They used to, but for some reason not anymore. Nix still works fine, but the only way to update the replit.nix file is to either
cat the file and copy + paste that into the editor, or just re-type the entire file from scratch. Device is a chromebook (so ChromeOS), with chrome version 93.0.4577.85
In nix based repls (created after Feb 22 I think) there's now a "Show hidden files" entry in the kebab menu of the files panel. It'll reveal nix files, repl, binaries and .o files. You can add/change patterns for hidden files in .replit.