Welcome to the WD USER forums where users (not WD employees) help one another. Here are some tips for you about any forum. Do not ask about a new topic in an unrelated forum. Create a new topic.
You need to copy and paste your questions into a new topic. Most all existing topics relate to issues with specific devices. Yours does not, I suggest you post yours in a more general forum such as one here named Off Topic Discussions. I say this because I understand you root question to be, “How do I export video created on iPad Pro for other devices to use?”
This question is better suited for the user forum at Apple! Here is a sample example at Apple forum.
As for what to store and distribute the media file on, I suggest a WD NAS (i.e. Network Accessible Storage device.) Here is a link to what I am referring to:
You can get this in two or four disk versions of various disk capacities. It must be connected to the local network router and users can access it either locally or remotely, It can store two copies of all data files in case a disk fails.
Hope this info gets you in the right direction I think with this project you will need professional assistance. Begin with your IT department.