Smartphone schematic page in PDF covering the charger and data circuit, part of a sectioned series of roughly 4.78 MB pages with no model stated. Expect the USB connector pinout, VBUS protection, charging IC, data lines and the battery connector path. It is the page to open for not-charging, slow-charging or no-PC-connection faults, letting you measure VBUS and trace D+ and D- lines to the processor. Check for a short on VBUS with a meter first, and make sure the drawing matches your handset.
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 @phoneSchematics. 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.