How to upload images on Linkedin
Unfortunatelly to upload images on Linkedin, you have to be a Linkedin Marketing Partner. Before was hard to become a Marketing Partner and for this reason on Midrub was available only Linkedin Companies for the Linkedin Marketing Partners.
If you are Linkedin Marketing Partner go to Midrub -> Administrator -> User -> Networks -> Linkedin or Linkedin Companies and enable the option "I am a Linkedin Marketing Partner" and you will have more options for Linkedin. If you aren't a Linkedin Marketing Partner you will get errors by enabling this option.