Boardview file labelled for the iPhone 7 Plus Intel baseband board, in .bvr format. At only 13.8 KB it is unusually small for a full phone layout, so it may be partial, compressed differently or incomplete; open it and confirm it renders properly before depending on it. Board number and revision are not stated. A working boardview lets you locate parts, highlight nets and find probe points, and the Intel variant matters because the modem area differs from the Qualcomm version of the same model.
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 @GENERAL_SMART_PHONE_SCHEMATICS. 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.