Unable to upload 11.5GB zipped citygml files to cesium ion

I was trying to upload building data to cesium ion from my local directory. Building files details are below
– buildings data uncompressed citygml files - 299 GB
– compressed file - 11.5 GB.
When I am uploading the compressed file, it was uploaded successfully but failed in the tiling process. Error screenshot as shown below


When I try to upload one of those uncompressed files sized 8.5 GB, it was uploaded and tiled successfully.

– Please let me know how to upload huge citygml files.
– Also when we link data directly from the S3 bucket, will it occupy the space of cesium ion? Will the tiling issue of uploading huge files can be overcome when uploading from S3?