[google-cloud-sql-discuss] import with csv fails

I'm trying to load several csv files in the range of 100Mo-8Go on Cloud SQL.

I expected the best way to to it would be to put the csv files in CloudStorage, then through an importation in the UI of Cloud SQL

When I tried to do this, after a very long time of "Importing data...", a notification of error appears, with no precision of what caused it, just a red message "Unknown Error"

I tried to split the file in chunks and it is currently loading without error using the command described in the documentation 

LOAD DATA LOCAL INFILE 'myfile-chunk-143.csv' 

 REPLACE INTO TABLE mytable CHARACTER SET 'utf8' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' ESCAPED BY '"'

So my guess it's either  a faulty line in my file  (but how can I detect it if I don't know the error?)

Is there any way for me to access a more precise description of the error that occured ?

Am I using the best way to put this amount of data ? 

also, my menu is now stuck in mode "Importing data..." while the job has failed an hour ago. Should I just wait or is it possible it got stuck ?

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