I have three lines, 20 M upload. My only goal is to upload pictures to Dropbox. If I connect one computer and the three lines to this router will it effeciently use all three lines to give me a 60 M u

I want to upload photos from ONE computer to dropbox. I have 3 lines, 20 mb up each line. Will the TL R480T+ combine these lines so I can use one computer and all 60 mb of upload.

In the market for a tl 480t+. There is a huge price difference online. Anywhere where from $50 to $150. Is there something I should watch out for? Are there variations or frauds?