Hello,
I've taken a look at your video and while the best option is to download the individual folders (via zip option), it can be setup to download individual (selected) files and upload them as well. I'm assuming you're using a Linux server for this site?
As far as the backend/admin, I can take a look at that and see what is wrong there. This should be something very simplistic to change, but we'll see.
If you'll look at my profile (click the link directly, don't go by what they show in this specific bid), you'll see 100% project completion, 100% positive (5 star) feedback, and a link to my own site where I've done the same for better than 10 years now. Your project will be completed with the same diligence and persistance. Your task will be completed within a 2-3 day period of time, and be given everything needed to be done right.
I look forward to hearing from you and working with you on this project.
Tom Whiting