We also need to install the proper codecs which work on reaper 6.43 and up, specifically FFMPEG 4.4. This will enable us to export videos with a minimal number of steps directly to commonly used formats used in social media.
Downloads for ffmpeg, latest version compatible with REAPER:
open reaper, then go to the options menu, then select Show REAPER resource path in explorer/finder
or alternatively on windows, press windows key plus r, then copy and paste:
%appdata%\REAPER\UserPlugins
or if using a portable reaper installation or some other set up that does not include the default locations, find the user plugins folder where osara was installed.