After adding an Alembic Animation to my project, the project upload is stuck at 100% when I try to launch the session. After checking the UEFN Log, I found the line printing the error, this might help you fix it.
Thank you for your report! Can you please re-post using the “New Issue” option on the Issues and Bug Reporting forums? Posts with this feature are connected directly into our development team so we can quickly get to them!
For more information, such as how to get the reference ID, please check out the article here: Using the Creative and UEFN Bug Reporting Form