Family Historian uses a nonstandard GEDCOM tag to identify multimedia files. It uses _FILE rather than FILE. To allow GED-GEN to recognize your multimedia files and create your gallery web pages, please enable the option “Process nonstandard tags.” This option is found in GED-GEN on the Program tab, under GEDCOM.
Please be aware of the following condition when you export a GEDCOM file using Family Historian version 4.1.3. An individual’s complete name is included in a NAME record as expected. However Family Historian apparently does not process certain optional parts of a name, like a separate given name and surname.