This can be so many things, including a problem with the website. The steps you can take to verify that it is not on your end:
1. Double check your file before uploading. Any cleanup you can do and then re-save it.
2. Upload the file again.
3. Sometimes it can take up to a couple hours to be ready for viewing. Normally it should not take that long, maybe 10 minutes, but wait and see.
If it is a supported file type and these steps do not help, then there could be a problem with the translation.
Jay Miller
BHB Consulting Engineers, P.C.