You should be able to upload a file in a few days. Otherwise, if you can give us a link to the model, or upload to Google Drive, iCloud, or any other service that allows public links, and post the link. Take some time to read through the Getting Started guide in the forums as well.
It seemed to have worked by cutting the model in half and just printing twice
Is the model too large to fit on the bed? Luban turns the object red and won’t slice if it doesn’t fit inside the build volume. Sometimes just rotating the part so the longest axis goes from corner to corner instead of side to side works. Other times I can shrink it a little bit to get it in bounds, although it can cause some fine detail to get lost.