A user reported that they could not cancel a history file import (in their case spotify extended streaming history).
I think it was a case of the import taking too much time to start (giving the impression it was failed) as it succeeded in the meantime.

In any case, they tried to cancel the import but got a generic error message back (see screenshot).
We should investigate if a blo0vcked/pending import can be successfully cancelled. Same for an ongoing import, we should ideally be able to cancel an ongoing one, although I don't know how we can message the service that processes imports asynchronously.