Metadata file is required aside any audio file. This requirement ensures that once a couple audio+metadata is present in the client's directory, JUpload can safely process them, without missing any important information such as date of the audio which would be unknown if not for the metadata file.
Metadata, whichever their format, are validated by our system before being processed. You will find below some details about the expected format for each piece of data.
Phone number are expected to be using the E.164 standard, for example
Date and time
Valid date and time format are either UTC,
2019-06-09T11:14:56Z or localized on your configuration's timezone,