I installed module v1.0.6 for my site Magento 2.2.6.
Exporting the categories to a file csv is fine, however, when I use this exporting file CSV to import, we have validation issues: "Sorry, but the data is invalid or the file is not uploaded".
How to fix it?
This error happened since the file separator is missing in M2.2.6.
To fix the error, please edit file app/code/Bss/CategoriesImportExport/Model/Source/Import/Behavior/Category.php as below: