Only Video or channel?
There is no such tool to make your video for ranking on top. Try to buy views and comments from other people to rank in top searches.
Not sure how dropbox is going to rank anything for you. What kind of content are you trying to market? You should scrape or buy links specific to your content and post to them manually or very carefully using an automated tool such as GSA or Ultimate Demon. Don't blast the net with garbage it's smart enough to see it now and destroy anything you're trying to get out there.
Youtube views will help to rank your video and there are some other tools to do. I never used GSA or Scrape box or anything to rank videos except the views exchange.
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I don't think you can get help from Dropbox in ranking your youtube video. It's a cloud storage buddy. What kind of video are you making? If you want your video to rank higher then I suggest you do something about its view. Do an active promotion in Facebook and Twitter to increase views, run a campaign from microjob sites to get likes and comments.
Got my feet in the water with youtube 2 weeks ago, posted a howto video on downloading pc games, got 1000 HR views of BHW (got 5000 delivered), posted it in 2-3 facebook groups and now i am on page 1 #10 video for my exact keyword.
Is it really that easy? that would mean you just have to invest 2-3$ for a video in views.