Error Uploading Large File with Drag and Drop

Good Afternoon - I have run into an issue with my install of Gitlab CE 8.17 when uploading a somewhat large file (~1GB) that I would like to run past the forum. After navigating to the project and directory and selecting upload file everything seems to work fine. At the very end of the upload instead of seeing getting a message indicating a success I get the below output indicating gitlab is not responding (502). I have tried this in various browsers many times.

Thank you very much!