Basically the title.
I have also tried uploading the library from my local computer files, and again, every object placed goes missing once it's uploaded to the server and turns into a dot.
Initially, the whole AC29 library package was missing from my BIMcloud, only going as far up as 28. I am using AC29, so that was obviously the issue. I contacted support, they uploaded the 29 library package for me (AC29INT) and tried uploading my project again. Still nothing.
