So, I generated a layer tracking on mocha ae and imported into AE, applied to my layer and everything is fine. However when I try to add a stroke (generate>stroke) the stroke simply does not appear.
I guess it's because it's not a Mask per say, but that's the only way I found on to copy the paths from mocha.
If you want to apply effects such as stroke to a Mocha generated roto shape, you need to "paste as an AE mask".
If you are running Mocha AE and have a roto shape on the clipboard, you will see 2 different paste options under edit menu:
Paste (pastes Mocha as Mocha shape plug-in - good for variable edge feathering)
Paste AE Mask - converts Mocha shape to AE mask