I hope I'm submitting this feature request to the correct place, not quite sure.

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Accessing the files attribute of an input element returns the files as FileList object, which is - AFAIK - part of the FileSystem API and therefore grants only read-only access to its contents.

Unfortunately there are several common use cases which would require the ability to programmatically _remove_ particular files from the FileList, which seems not to be possible currently.

For example:

a) Checking the file.size for some limit before uploading, if limit is exceeded exclude the particular file from uploading.

b) Giving the end-user an opportunity of reviewing his file selection and to exclude accidentally selected files.

Here's the discussion of a guy facing the same problem:
http://stackoverflow.com/questions/3144419/how-do-i-remove-a-file-from-the-filelist