Process Chain launch after file upload

Hi experts,

Basis team oe end users uplaod some files into a server manually.I will create an abap program to upload csv files into al11 server.

I would like to launch a BW process chain automatically each time a new file version is uploaded to the al11 server.

I thought about creating an event to manage my case. But how can I know that a new file version was uploaded.

I mean do I have to create a program which reads the date/Hour modification regularly (each hour/day)?

Are they any better options?

Thanks.

Amine