G4_0186.mp4

Devices like GoPro or DJI often use sequential naming conventions (e.g., "G" for GoPro, followed by chapter or file numbers).

Cloud services or local transfers sometimes rename files into this format during sync. Technical Profile of an MP4 File g4_0186.mp4

While the specific content of is unknown, as an MP4 (MPEG-4 Part 14) file, it likely follows these standards according to Wikipedia : Devices like GoPro or DJI often use sequential