What you see on that pane are objects loaded in memory, not files, and the difference is that the objects listed under "data", are any sort of dataframe (included tibbles, data.table, etc), and the ones listed under "values" are, lists, vectors of some class, matrices, etc.
Those "techniques" are for creating a reproducible example, not for loading your data, and by the way, we are going to need a reproducible example in order to help you any further, so please read this FAQ and try to make one.