As a sole trader, consultant, working globally with clients who want to see videos and documents that can add up to large file groups, I use three solutions.
Dropbox is useful but have had some issues with links not working. American unfortunately.
Basecamp is a collaboration system that I find works very well and I use some of its features (not all) when I need long term access from a new client or during an extended sales discussion. Some can take years! Again American unfortunately.
wetransfer.com, For short term availability with no (apparent) American connections as it is Dutch company, I recommend wetransfer.com as it just 'does what it says on the tin'. Only one supplier firewall/spam filter had an issue with initial notification email, I dont know why, but other than that all customers are happy to get their information this way.