Is mixed-gender charity work involving young men and women, and traveling together in medical convoys, forbidden (haram)? And is publishing photos or praising the association considered an invitation to that which is forbidden (haram)?

The basic rule is that a woman is not permitted to travel without a mahram. It is advisable to assign male doctors for travel and keep female doctors within the governorate. Photographing convoys is forbidden if it includes unlawful scenes, such as the mixing of males and females. As for commending the association for this good deed, there is no harm in it, especially if there is a benefit, such as the poor coming forward to the medical convoys to meet their needs.