Quick question: Can you use flow to migrate a folder or even a library to a different site in SP Online while KEEPING the metadata associated with it?
Yes it is possible using Flow. The destination Document Library and metadata columns must be created first.
Here is a sample Flow and before and after images (see Metadata column).
I hope this helps.
@Norman Young Thank you! This helps. One small question. Did the created/modified date and "created by" date come over the same as well?
Sorry, no it doesn't do that. It treats the copy as a new file.