So literally just 15 minutes ago found the 4.2.4 update to DJI GO4 app for Android, updated it, powered up the Spark, controller, etc. Shut off the mobile device WIFI and plugged the OTG cable into the controller when it went green. Video feed just fine but ABSOLUTELY no telemetry. Then I side-swiped a tree limb by my driveway and took out 2 propellers! Lol! Does not appear that there is any telemetry support for the Spark using OTG. It would be nice if DJI would consider it in yet another update to the app.