.......
- you can't enter the ship (and stow the SRV) while you've still cargo on board, so you will need to transfer the cargo to the ship first (crotch menu). That is, provided you got the storage space on your ship...
You can board ship with cargo in the SRV (assuming you have space in the ship's hold) - it gets transferred to the hold automatically.
There is now an option to transfer cargo to the ship. My main problem was trying to get in position to reboard though.
Edit: sorry, misunderstood your mssg. I meant that when I reboard the ship it automatically transfered the cargo.
I am embarrassed to admit that it took me weeks before I realised there was a "board ship" light.