First let me just say that the data Import & Export in LW is mostly excellent.
Sadly it's ruined by a couple of small bugs that don't seem to ever get fixed.
These bugs have caused me to waste so much time over the years. You have no idea.
I have 20 or so scheduled imports. The summary file reports success. as below.
Download the file and then there is a list of 2 or 3 errors out of 1500 or so rows
In fact what would really work well is if instead of always reporting success in the summary. If it linked to a list of JUST a summary of the errors.
Straight away then we have what we need to get things working rather than this triple-blind experience of hunting out a report downloading it scrolling down thousands of lines to find the culprit.