var filename: String?
The filename for the exported serialization data if the exportType
is
SerializationExportType.FILE_URL
.
The filename extension for JSON will be automatically added.
It can be an absolute path or file URL or a relative path.
If some relative path is chosen it will be created in a temporary system directory and
overwritten
if the corresponding file already exists. If the value is null
an new temporary file
will be
created for every export based on the filename for the exported image or video data.