This is an error we get from the replicate activities entry in workflow. If we try again it works.
There was an error decompressing the briefcase. The briefcase file may be corrupt, the disk may be out of space, or another I/O error occurred. [9265] [ReplicateEntries_Import]
It says your disk could be out of space, it is not. I found on answers that you can not import over 1GB but it is a document less than 1GB in size.
My best guess is that there is a limit on how many briefcases you can import at once, similar to how there is a limit on how many scripts you can run at once because there is a limited amount of memory space to write to.