how to successfully send a file to Orthanc?

I try send a ECG file to Orthanc and then callback it.I am failure .The contents in the log are :

Unknown remote DICOM modality AET: "STORESCU"
Find requests are disallowed for the AET "STORESCU"
DIMSE failure (aborting association): DIMSE Caller passed in an illegal association

Can you tell me what's wrong ?
thank you!

Well, this indicates the fact that your DICOM client is not known to Orthanc.

You will have to create an Orthanc configuration file and modify the “DicomModalities” section to reflect the parameters of your DICOM client.