Boardview in BVR format labelled for the iPhone 7 Plus with the Intel baseband, only 13.8 KB in size. That is much smaller than other iPhone BVR files here, so the content may be partial or stored differently; open it in a BVR-capable viewer and check it renders a complete board. Intel and Qualcomm 7 Plus boards differ around the modem section, so match the variant on your board. When complete, it serves for locating components, test points and tracing power and signal nets.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .bvr file
Text boardview from the BoardView R family of tools, seen for Lenovo, MSI and Clevo boards.