In JS you can use the File Upload Helper that uses a service that users your 'Files'. In JS its pretty straight forward BUT its external code and not a simple call to an internal Apperyio command so I don't know if similar methods exist for Ionic. uploadMultipleFilesHelper(srv_FileUploadX, Apperyio(...
are you SURE you're passing the 'exact' string'? You should do a console.log on "PARAMS.QUERY.email" to verify that it matches what you're expecting. If it works hard-coded then you're most likely not matching that request.