You can not do that if you want to publish them as "publications". However, as Wolfgang R. Dick mentioned, you can add the file you attached as "Data", or instead, you can add it as a new format by following these steps:
(Add new - Other - Add new format)
Good question, but it is best to add manually all of your published paper one by one...
There is no such function in ResearchGate. As Emad Kamil Hussein wrote, the idea is to have an entry for each publication. However, you may add your PDF file with the list of all publications in "Data" (click "Add new", then "Data"). Although "Data" is for other kinds of documents, putting your list there will work.
Just add each publication separately. I know it might take sometime from you but its worth it!
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