I just symlinked a few plugins from an “outside” folder into the FoldingText plug-ins folder, with commands along the lines of:
$ cd ~/Library/Containers/com.foldingtext.FoldingText/Data/Library/Application Support/FoldingText/Plug-Ins/ $ ln -s ~/Dropbox/Dev/plugins_repo/*.ftplugin .
The symlinks are confirmed to have been correctly produced.
However, in the plugin manager I get the following error for every symlinked package:
Missing package.json file
A bug possibly?