Spanish training PDF on identifying the parts of a smartphone, describing the main components and modules found inside a typical handset. It names no specific model or board. Material like this helps a beginner recognise the motherboard, battery connector, display and charge flex, cameras, antennas and key ICs before disassembly or diagnosis. The 404 KB file appears to match the numbered topic 4 of the same course and opens in any PDF reader, so it works as introductory reference rather than a board-level diagram.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @canalesquematicos. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.