Well, this morning, I made some good progress paving more roads for a smaller city. When I finished, I went to upload the few hours of my updated work to Realms, but alas, the (-1) Error has returned again, bugging me like it inevitably does. Despite doing its buggy little dance, I know this is going to be temporary. You game developers are really great people!
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Thank you for your report!
We're actually already tracking this issue in REALMS-2159, so I've resolved and linked this ticket as a duplicate.
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