Please create a bug report on the UE4 Answerhub (follow the link in my signature). For the project you wish to send, please reduce the filesize as much as possible. Remove all content that is not necessary to reproduce the issue.
You can attach the project to the Answerhub post if it is small enough, or you can provide a link to the download. If you wish to only share the file with Epic, you can wait until one of Epic’s Support Technicians contacts you on the Answerhub post, and then you can use the forums to send them a PM.
Thanks