BulkImportFile and assign to item set


I’m working on a photo, audio and video archive project and It seems that omeka is quite suitable for my need.
I’m I’m very new to Omeka S and I’m probably missing some concepts.

When I proceed to a bulk import of files, how can you assign these medias to an existing item set ?
Is it possible to do it automatically or I must manually affect these items to items set ?

Thank you for your answer

CSV Import will allow you to do this.

Here is the documentation on the CSV Import Module:
CSV Import Documentation