The core of the idea of integration R and Qlik Sense is not to do that.
We do not want to export data to do something in R. Via selection in Qlik and via integration with R we send the data which we want to process in R, get it processed and place results on chart - and all that invisibly for user. Why don't you try to integrate R with your application?
What you have described as "the core of the idea... is exactly what I am trying to accomplish: the input data is originating from QLIK Sense visualized after a selection. In addition to the export function which involves a non-"invisible" step, my question is how to use get QLIK Sense to send this data to R "invisibly" and following manipulation in R invisibly, R can return it back to QLIK Sense invisibly as an outputted file for ongoing QLIK Sense action -- "all that invisibly for the user.".
R is already integrated into my QLIK Sense Desktop, using the instructions posted here and getting help from kind and generous members of the group like you; without this latter group, I wouldn't have gotten this far, at least, not this fast.
It will really help me and I will appreciate it if you have an answer to my question. Thanks in advance.