For transfers to ECMWF, we recommend using rsync which will transfer the files over an ssh connection. For that, you will need to have Teleport configured configured with the apropriate settings appropriate settings in your ssh config file.
Any file transfer tool that supports SSH and the ProxyJump feature should work, such as the command line tools sftp or scp. Alternatively, you may also use the Linux Virtual Desktop and and its folder sharing capabilites to capabilities to copy local files to your ECMWF's HOME or PERM.
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