On https://hangouts.google.com or https://gmail.com
Double click the contact to report to open the chat window
Click the gear button
Click the Block & report button
Check the Also report checkbox
Older related Q&A (they don't mentions the above steps)
How do I report spam/scam attempts in Hangouts?
How do I report scammers on Google Hangouts?
I am having this exact issue.
The files are 360 video files, about 4 GB each, and an hours recording can produce 6-10 of them. Backing up the videos can take DAYS...even if leaving the computer on overnight!
I suspect that if only a percentage of the file is backed up before I need to shut down, that is lost and the process starts over from scratch when ...