[GNC] importing multiple CSVs to Gnucash

[flywire]

This is a bad idea. You are thinking logically like other software but you
don't understand it MUST go through account matching which is ALWAYS a
manual process that doesn't really recognise the Transfer Account in your
data (details in thread:
https://lists.gnucash.org/pipermail/gnucash-user/2020-April/090631.html ).
There will be so many data entry errors that the import will be a failure.

Best approach is as others describe, import a few small files first (say
<=50 transactions) to train the system then it will import a large number
of transactions with a small amount of manual input. You probably don't
believe the advice, but you will.