I forgot that with Prime you get free unlimited photo storage (a lookalike of the $12/year tier) until a sibling comment on the OP. Since then I've done bursts

I forgot that with Prime you get free unlimited photo storage (a lookalike of the $12/year tier) until a sibling comment on the OP. Since then I've done bursts of uploading with rclone from two different networks, first a slower one, and then a faster one. Amazon throttles you pretty aggressively, and rclone occasionally just appears to pause indefinitely (on Win64) as it's waiting for the pacer or a response. It's a bit annoying and confusing and I'm not sure how to proceed other than to kill the process. Luckily it's nondestructive to just start it again with the same args. Though low-tech, a wrapper script around it could automate that away too.