Google Analytics Import "Client file upload failed: 6"

Hello! I’m using Matomo On Premise, together with latest version of the Google Analytics Import Plugin and get the following error when I try to upload the JSON file:
“Client file upload failed: 6”. Where can I find the meaning and solution to different error codes from Matomo?

For further information, the network request header gets status code 302.
And the request header referer is:

How to solve this to do the import?

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