General FTP rules for the ingestion account:
Do not create directories
Do not compress files (eg, no zips, tars, gzips, etc) except for layout files
Do not upload more than 4 GB of files per ingestion
Follow the naming conventions
Note: The root directory of the FTP account is processed on regular basis. If your files do not appear in the ingestion list after a processing cycle, check the hold directory of the FTP account. Files are moved to the hold directory if the ISBN in the file name is not present in the database. When new product formats are created, TitleLeaf will check for matching files in the hold directory for ingestion.