Used Compass > Import Collection > CSV > local file of a very large CSV file (3.7GB) from http://prod.publicdata.landregistry.gov.uk.s3-website-eu-west-1.amazonaws.com/pp-complete.csv from 
https://www.gov.uk/government/statistical-data-sets/price-paid-data-downloads

creates error after 20 sec of attempting to complete import. After clicking on "Import" button to continue, it seems to try again. Screenshot of database collections shows "0" documents, but inspecting the collection shows that 2.9m documents were saved.

Perhaps also give guidance to Compass users what the max size of an import file that could be attempted.