The recent Portal update has moved some functionality around and renamed the place where you perform Environment Transfers to Migrations. Given that what you do there is an Environment Transfer and has nothing to do with Migrations and that there are actual migrations between release 20.10.x and 6xxxx, I would really like this page to be renamed: Environments or Environment Transfer.
I can understand that from a technical back-end person's point of view you are copying data from one cloud repository to another which could be seen as a migration of some sort. But for the other 99.999999% of the world, this is confusing.