[ryerman]

My 2¢ worth re: File icons in the Media Library

If it is possible to click on the icon and upload the file to the cloud, either immediately or through some dialogue, then an up-arrow is appropriate.
But if the icon is just window-dressing and "unclickable", then it should be a cloud if the file was previously uploaded, with no icon otherwise.

For me, the up-arrow implies "click here to upload". Don't use if it's only function is informational.