In IIS, I've added the .apk extension with the mime type of "application/vnd.android.package-archive" which changed the error message I was getting in the android browser from something about not being a supported file to "Cannot finish download. There is not enough space." Which I don't understand this error since I've got like 48MB of free space on the device and it's a 9KB file.
Anyone run into this before?
(And yes, I've allows other sources in my settings)