Hi Ric,
I'm happy to say that we have found and fixed this problem, through the assistance of Ian in this thread: https://wordpress.org/support/topic/upload-timeout-to-google-drive
The fix will be in Monday's release of UpdraftPlus 1.9.64; or users can get it now by updating to the development version - https://updraftplus.com/faqs/devversion/ - which is currently equal to UD 1.9.63 plus this fix plus a Slovenian translation. (It will still show as version 1.9.63 after installing - Monday's 1.9.64 has some other tweaks too).
Thank you for your assistance in nailing this issue!
Best wishes,
David