I’m working on getting this working as well. I tried used the MPWP SSD with FiLMiC Pro right after this feature was announced. I noticed that there was a new FiLMiC Pro app available that stated one of the updates was support for this feature. After downloading the update and setting it up etc. I could not get it to work.
However, several days late another FiLMiC Pro update was released and it mentioned bug fixes and improvements in the release notes. I’ve not had a chance to test the latest version of the app, but I also feel that it would be worth getting in touch with support at FiLMIC Pro, email@example.com
I’ll try getting it working over the weekend and report back with either success or failure.
I hope this helps.