Good job on what you have done so far @applelit
But here is the list of files that were "Not valid to import"
UISwitchButtonLeftShadowed.png
UISwitchButtonOff.png
UISwitchButtonOn.png
UISwitchButtonRightShadowed.png
UISwitchTrackBlue.png
UISwitchTrackClear.pong
UISwitchTrackOrange.png
Here is also the list of all the images you compressed and their ORIGINAL sizes (from the "Other.artwork" file) So they need to be the exact same size as the original, or smaller.
UISwitchButtonLeftShadowed.png - 621 bytes
UISwitchButtonOff.png - 379 bytes
UISwitchButtonOn.png - 78 bytes
UISwitchButtonRightShadowed.png - 636 bytes
UISwitchTrackBlue.png - 678 bytes
UISwitchTrackClear.png - 499 bytes
UISwitchTrackOrange.png - 599 bytes
So pretty much we have to make all those images you listed above - the sizes of or under the following images? is that correct? (don't want to make a mistake). I am just worried about quality loss at this stage.
UISwitchButtonLeftShadowed.png - 621 bytes
UISwitchButtonOff.png - 379 bytes
UISwitchButtonOn.png - 78 bytes
UISwitchButtonRightShadowed.png - 636 bytes
UISwitchTrackBlue.png - 678 bytes
UISwitchTrackClear.png - 499 bytes
UISwitchTrackOrange.png - 599 bytes