@PepTerradellas,
Welcome to Skyline Communities!!!
The possible reasons for log failures while uploading huge files can be any of the following reasons:
• A minimum of 3Mb/s external network bandwidth for the sending of large files (support bundles) could not have been met
• Proxy might not be configured to allow large files, in case of the proxy being used.
• If the log transfer request did not complete in the maximum allowed time of 6 hours
For more details refer to below KB:
https://kb.vmware.com/s/article/78957
Sincerely
Srikanth HS
Skyline Support Moderator