Yes, everything is ok. Thanks to all who has taken part in this.
I have uploaded the gallery, but something weird happened that I don't understand:
At first I called it 'tab-gallery', and when exporting I get this _exported as part of the folder name. So I wanted to get rid of that bit, but it was simply not possible. I keep my web folders in my dropbox, and after several attempts I moved the folder to desktop and finally got rid of the ending. Back into the dropbox, and the ending was back! I uploaded, and I got the folder with the _exported uploaded, but when trying the one without, DFTP collapsed - over and over again. I tried Filezilla, it didn't collapse, but the file transfers failed. I tried to remove the -exported bit from the folder I had managed to upload, NO WAY! DFTP collapsed again. So I wonder if the name 'tab-gallery' has any special meaning, or whatever else it could be causing the trouble. Eventually I solved it by calling the project and the exported folder 'tabbed-gallery'. That worked.
I don't need any help with this, I got everything uploaded in the end, but if someone has any knowledge to share, what on earth I was up against, I would be very interested.