John see below.
1. Cant comment too much without knowing alot more info but we integrate with vb4 fine so maybe read the cookie login issue thread in the FAQ forum.
2. There are plenty of threads here on upload issue so doing a search here for your error should get a result
3. You can embed a video as long as you have that option turned on in showphoto options in admin and its one of the types that are embedded.
4. No you can not bulk copy photo descriptions links etc. Copy and Paste is windows is per use thats how that computer feature works kinda really outside our software which resides on a server.