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For direct (cable or wlan) file transfer RCU, as already suggested in an other comment. For uploads to the cloud storage rMAPI.
If you are at ease with the command line, pdf2remarkable.sh could allow you to easily push pdfs from your laptop to your rM. You'd need to setup a ssh key to make it easier.
I'm pretty happy with rmfuse: https://github.com/rschroll/rmfuse
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Hence, a higher number means a more popular project.