Moving 10TB takes some time even on the backside of Dropbox as that's not instant.
It's not a file number limit. I was in the process of dropping 1000 files into a single directory:
I have a directory with 5000 directories in it so it's not a number of items.
Dropbox (in theory) doesn't have a size limit in a folder, but I can't put 10TB in a folder easily to see.
The ls is just a read dir all so it's not even hitting the size of the files.
If a basic ls command with a TPS of 1 gives you an error, does a rclone ls on that same location produce an error going directly to the remote? No mount.
rclone ls remotename:plot1 or whatnot, whever it's 'broken'