Best Multi Variant Bulk Editor Suggestions

[Studio 42]

categ1-alias,categ2-alias or categ1-alias|categ2-alias is valid.
But if you don't used same column name, then you have to manually change it in the header (dropdown list) for each column you want to import.
In your case the column name is "categories.slug"

[aftertaf]

hmm, i still have issues and i dont get why...
here is the file i try to upload, any clue what is wrong with it ?

[Studio 42]

First, you should not use manufacturer.slug and manufacturer.name in same sheet.
Only old Excel is supported and best is to use ods (or csv). You can convert it with google sheet for eg. it worked always for me and is 10 times faster as xls, because the format of xls is many more complex(ods is a zip with multiple xml and is perfect for ajax stream reading).
See the attached file, it imported all products

[aftertaf]

i dunno if it's excel365 that is killing the file format, but it keeps giving me HTTP 200:

"Fichier :Copy of Import-Virtuemart_with_VmBePro.ods (6 KB) 100% preloading sheets , this can take some secondes !
Error: -200, Message: HTTP Error., File: Copy of Import-Virtuemart_with_VmBePro.ods"

ill try with OoO

[Studio 42]

As i said, this is typical a upload problem. Have you checked your folder rights in the images directory ?

[aftertaf]

i did and i didnt see anything wrong. But that could be a #fail on my behalf... ill let u know if i find anything

[aftertaf]

I've fixed permissions with akeeba admin tools, just in case.
I've also tested some files i made, in .CSV.
3.csv is accepted fine and i can reach the 4.import button. I just can't figure out what the difference is between 3.csv and the other 2 files.