For anyone playing solo, and got confused how to proceed certain mission that requires you to take more than 1 parts of something:
1. Press up directional button on gamepad
If you are on keyboard i believe it's "G" maybe(to throw away what you are carrying ussually a weapon case)
2. Take the mission objective part.
3. Throw the part you've just take.
4. Repeat the step 1 to 3.
5. Take all of them to your truck.
6. Careful not to leave weapon case/bag you were carrying.
[Edited by xdiva, 11/7/2018 9:11:05 PM]
I should have read your message before leaving the mission because I thought I had bugged her. lol