BVR boardview, probably for the iPhone SE, if iPSE is read as the usual shorthand. The 306 KB file opens in FlexBV and other viewers that read BVR, and shows component placement and net connectivity on the logic board. Technicians use it to find capacitors on a shorted line, follow connector pins, and pick test points for diode-mode measurements. No board number or revision is given, so compare the layout with the actual PCB, especially since several SE generations exist.
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.