Web Designer - Upload File node - Load content to local collection

Hi experts,

I am a bit stuck on the component mentioned in the subject.
In short, my goal is to create a web function where the contents of a .csv file can be uploaded to a local collection and then processed using a custom script.

My problem at the moment is that I get the error message "There is no cursor defined on the collection InputDatas". I have tried to solve the problem using various methods (such as creating a local component and adding a cursor there), but it fails.

The Upload File node parameters are currently:
Upload Target: Collection
Collection: InputDatas
Property: Bytes

Parameters of the InputDatas collection:
Type: Database query (I think this can be a problem)
Property: Bytes [System.Bytes]

The error is probably in me, however, what is the way or what is the practice to solve this kind of problem? Or maybe there is another way to implement the basic idea?
I will add more information if needed.

Version: 8.2.1

Thanks in advance for any help!