The long string of letters and numbers ( 9E0FD1DD... ) is a Universally Unique Identifier (UUID). Apple devices often use these unique strings to name files generated during editing to ensure they don't overwrite the original "IMG_XXXX.MOV" file.
This is a standard QuickTime File Format (QTFF) container used by Apple for high-quality video, typically encoded with H.264 or HEVC codecs. Key Characteristics of These Files trim.9E0FD1DD-6D66-4C1F-B42B-46DEA315F52B.MOV
If the file size is too large for email, converting it to an MP4 using Handbrake or Movavi is a common next step. The long string of letters and numbers ( 9E0FD1DD