Changes to Owncloud Setup -- 2

I am looking for someone to assist me with changes to my Owncloud setup, or suggest and assist with an alternative. - 1. Firstly (and most importantly), increasing the max file size upload to at least 2GB. I am on shared hosting, with [login to view URL] - 2. Upgrading my owncloud setup from 7.0.2 to 8.0.3 - 3. Changing the Owncloud logo(s) to my company logos - 4. Maybe outlining some instructions for me to be able to upgrade to new versions in the future. If #1. is not possible, then any recommendations and help with another setup/subscription would be most grateful, and I will modify the project terms accordingly. I am willing to change hosts, or use another cloud service if necessary. What I ultimately need is a service with 2TB storage (for backup purposes) that accepts large file sizes (HD video files), and the ability to expand storage at a cheap/reasonable cost. The idea is to be able to backup a film studios video files to the cloud, and also allow clients to upload their footage securely to the cloud, that employees can then view/download/categorise. If you need more info, please message me.