Detects the real content type of a file by reading its magic bytes.
Used by Attached.Originals during ingest to override the caller-supplied
content type with the actual file type. Falls back to the supplied value
when the magic bytes are unrecognized.
Configuration
# Disable automatic detection (not recommended):
config :attached, identify_content_type: falseSummary
Functions
Reads up to 16 bytes from path and returns the detected MIME type,
or fallback if the file cannot be read or the type is unrecognized.