Tried it, charging doesn't work (at least using my Anker PB).
Theoretically, it should work, since OP charging case charges OP using the said port (even though, it only activates when it turned off).
Hi, thanks for the inquiry. We're sorry that the front USB connection in the Osmo Pocket is used to connect the mobile device and it's not recommended to charge or possibly use the external microphone. Thank you for understanding.