where in the code is the image uploading function?

[Yoshiburger]

I have trawled the forums as best I could and haven't found anything close to what I am trying to do... I would say I had RTFM'd, but I havent really found any FM's to read

I need to modify images as they are uploaded, but I cannot find any documentation on where exactly vBulletin 5 stashes its classes and functions.

where is exactly would one find the image upload function?

or HOW would one find it, if you don't know?

I have seen a few people posting here wanting the same results and I would be willing to share back the functionality when it gets to the working stage.

Thanks for your time!