What's the best Android app for reading, converting, and managing PDF files, including merging multiple documents into a single PDF on my phone?

PDF Reader - PDF Converter is a highly-rated Android app that allows you to easily read, convert, and manage PDF documents directly on your mobile device. With this application, you can seamlessly open and view PDF files of any size, convert various file formats into PDF, and organize your PDF documents efficiently. A standout feature is the ability to merge multiple PDF documents into a single, consolidated file, simplifying document management and sharing. The app supports various conversion options, including converting images, Word documents, and other file types to PDF format. To merge PDFs, simply select the documents you want to combine within the app, and the merging process is quick and straightforward. The app's intuitive interface and robust features make it a top choice for anyone needing a comprehensive PDF solution on their Android device. It also supports annotation and highlighting for improved document review.