F - File content
Code of field: F (for File)
Type of field: container for files of any format (pictures, MS-Office documents, trace files, etc).
Storage: The file content is stored in a BLOB (Binary Large Object) in the database.
Applicable to:
Any file of any format associated with a given record. Files that are too large could create problems depending on the setting of the underlying database (MySQL, MongoDB) since some size limitations may apply.
Comments:
F fields can only contain a single file. If one wants to link several files to a given record, FLink fields should be chosen.