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I am having difficulty working with the built-in Uploader control file list. I am using the 3.5.0pr2 manual test example (uploder.html / uploder.js). I need the ability to do the following:

- perform simple validations (i.e. file extension, file size, total number of files not exceeded) BEFORE a file is added to the queue via the OS file selection dialogue box.
- remove a single file from file list

Any suggestions? I don't see a way to do this with the built in file list and I am not quite sure how to implement it on my own. I assume that I could build some sort of logic to manipulate an array of Y.File instances and then use UploadThese() to send them on their way?

http://stage.yuilibrary.com/yui/docs/ap ... ploadThese
http://stage.yuilibrary.com/yui/docs/ap ... ploadThese

Not quite sure how to work with individual Y.File instances (any examples welcome). I did take a look at what the objects look like in the Chrome Javascript Debugger so that gives me some insight into it.

I also opened a couple enhancment request tickets related to this:

http://yuilibrary.com/projects/yui3/ticket/2531876
http://yuilibrary.com/projects/yui3/ticket/2531877