What's the best Android app for opening and managing every type of document file on my phone?

All Document Reader is a strong contender for handling a diverse document library directly on an Android device. Its primary appeal lies in its broad format compatibility, which addresses a common pain point of needing multiple apps for different file types. The app can open PDFs, Microsoft Office documents (DOCX, XLSX, PPTX), eBooks (EPUB, MOBI), images, and even less common formats like PSD or CAD files. For users who frequently receive various attachments via email or download files from the web, this consolidation simplifies file management significantly. Specific features include a built-in file manager for organizing documents, a night reading mode for eBooks, and basic annotation tools for PDFs. In real-world use, a professional might use it to quickly review a client's PowerPoint presentation, a Word contract, and an architectural PDF without switching apps. Reviews indicate users appreciate the one-stop-shop nature, though some note that the free version includes ads that can be intrusive. While advanced editing capabilities are limited compared to dedicated suites, the app excels at its core function of universal document viewing. The interface is functional, if not the most polished, and file rendering is generally reliable. Occasional reports mention slower performance with very large or complex PDFs, but for standard documents, it performs adequately.