This page is written to allow uploads.
Sorry, it is far from finished, but should do the job!
Click on 'Choose file', then choose the file to upload.
Type the password you were given into the box, then click on 'submit'.
After a while (progress may be shown somewhere - at the bottom on Chrome)
you should get to a 'Completed file upload' page to show it worked.
I have tested this on a PPTX file of 87mb which took 5 1/2 minutes to upload.
