Settings that configure the upload process across all supported upload targets.
File name fragment that becomes a part of the filenames of the uploaded video files in their respective upload target (see
output setting). That is, the complete file name further comprises a timestamp, a random token, and (if available) the original file name of the input video. Notice that the string given in
upload.filename will be sanitized to only use these characters, digits, the underscore (“_”), and the “dash” (-) symbol. Other characters will be replaced with an underscore symbol.