Bug in Android version of Adobe Reader!
Android Version of reader has errors.
When using Onedrive, It always makes local copy, even when OneDrive has the file available offline.
This does now allow in-place notation and the whole exercise fails. , since the edited file cannot be uploaded/synced to onedrive.
This behavior does not happen on apple iOS. You just have to make the file available offline. Same on PC it does not happen!