It’s not just “uploading”. You need to compile those sources into a binary which runs on the MOD CPU (ARM-A20), and you’re encouraged to create MOD-GUI and map relevant plugin parameters to knobs.
It’s not that hard to learn and all the tools (mod-sdk etc) are published on their https://github.com/moddevices site, easy to pick up and use for a developer like myself.
But if you have never done any development before or have no interest in it, you’re better off asking the developer(s) of the plugins that you’re interested to bring to the MOD. Which is a good idea regardless.
The MOD team also hosts workshops, “How to create MOD plugins”. There are at least two which I know about were at Linux Audio Conferences in the past.
Last but not least: http://wiki.moddevices.com/wiki/How_To_Build_and_Deploy_LV2_Plugin_to_MOD_Duo