Is it possible to preserve explored map progress when deleting chunks from the savefile/uploading it to a server?

The situation is that I need to set up a server to host a game previously was only local.
I tried hamachi, but it disconnects immediately (I blame the intercontinental lag since it works otherwise, but if you think it is something else, let’s talk in chat). As a consequence, now I’m trying with minehut.

As we like to explore, the save was beyond 2gb, so I trimmed it with MCAselector.

Now my question: we had made a giant map wall. After the trim, if I load the world locally, the map wall shows as before, but if I upload the save to minehut and log into the server, the maps are either missing or wrong/garbled.

I tried uploading the individual map_###.dat files and for some maps it helped, but not all.
Is there a way to preserve those maps? or should I give up and re-explore everything?