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Body Issue: Linking to PDFs I placed in `public/documents/` resulted in `No route matches [GET] /documents/cv.pdf` in the development environment. Cause: By default, the Rails development environment often doesn't serve static files from the `public` directory. This is typically enabled only in production for performance reasons. Resolution: 1. I enabled static file serving in development by setting `config.public_file_server.enabled = true` in `config/environments/development.rb`. 2. I ensured the PDF files were correctly placed in `til_tracker/public/documents/`. 3. I restarted the Rails server (`./bin/dev`). Learning: To serve static assets (like PDFs, images) directly from the `public` folder in the development environment, I learned I must explicitly set `config.public_file_server.enabled = true` in `config/environments/development.rb` and restart the server. In production, this is usually handled by the webserver (like Nginx or Apache) or enabled by default in `production.rb`.

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