I noticed iPhone topic on this, and wanted to mention you will have to remove the case of your Android phone too, unless it is extremelly thin.

I'm fine with my HTC 12+ and the original phone case that came with it.
(ie: it fits perfectly)

Hi Spacewease. Thank you for sharing this information with us. Should you have any question, please don't hesitate to reach us. Thanks for your support.

I use the Spigen Dual Armor case on my S9+ and another 1/8" on that USB-C connector would mean I could keep the case on while attaching the Osmo Pocket.  Would gladly pay a couple bucks for a longer USB-Connector from DJI.