The OVA URL can accept the FTP path. For reference, see the following sample input json.
Note:
The FTP user password is in the plain text. If your FTP server supports, you can also use ftp anonymous user.
{ "tcaMgr": { "name": "TCA Manager", "vmEndpoint": "1.2.3.4", "ovaUrl": "ftp://<ftp-user>:<password>@<ftp-server-IP>/VMware-Telco-Cloud-Automation-3.0.0-22803370.ova", ... } }