Hey @Olgashapiro ! Can you please try to re-upload your renderings and attach them once more? It seems something went wrong during the initial process.
OK
I did it:)))
It didn’t work yet I’m afraid. 
If you haven’t tried it, please head into the “Attachments” tab, upload your renderings there and then put them into your post by clicking “Insert into message”. Let me know if that doesn’t do the trick!