Either by uploading to the Steam Workshop or you need to zip the savegame folder and upload it to 1drive, gdrive or other free filehoster where you can share files.
Did not work unfortunately. Probably it is normal, but I noticed that the ‘Can’t find-signs’ reset after pausing the game. When resuming, they gradually show up again, but elsewhere.
I just updated to 6.05. In the release notes I see that the ‘can’t find customs’ issue has been fixed for arriving passengers. I keep on having this issue for departing passengers.