Modification on an existing excel without models

[CanMik]

Hello !

I'm kinda new to Laravel-Excel and I am trying to make changes to an existing excel file and save the file with the modifications as a new file.

I don't use any models or database, basically in input I have an excel file, then the user does modifications, then I have to apply these modifications.

But I don't know how to proceed, can someone enlighten me, and I can't find something in the documentation ?