Thanks for your answer.
I’ve tried once again with a new file including more items. Some more got imported (85 of 122) so I’m not sure if it is a server timeout.
Attached the uploaded file. I’ve market a few of them which are not imported. I can’t see any reason for this. Do you still think it is a sever timeout? If yes, I need to contact my hoster to increase it.
Thanks for your feedback and sorry for the additional work.