In the iPad app, there is no place to view all uploads that are in progress. This needs to bee a tab at the bottom of the app.
Also, there needs to be a way to cancel uploads. If looking at the specific folder where files are being uploaded, it shows an "x" beside each file, but pressing that x does not delete the file or stop the upload.
In general, the mobile app has difficulting uploading large or multiple files, it tends to stop or crash once the device turns off the screen. If the device has a break in connection, the transfer is very unlikely to finish un-attened and must be restarted by the user.