Was my client [name withheld] depressed because he picked up a lost soul spirit while visiting a cemetery and taking a photo of something he saw, and was that a spirit that he was photographing and did that act bring it to him and allow an attachment?

Yes, your question contains the answer. This is all of a piece. The outreach through curiosity to observe and to capture, in essence, as an image, set the intention to draw that energy to himself through the exact same impulse of curiosity and wanting to inspect and understand it. This is a danger in all such ghost hunting activities people need to be aware of. By exploring haunted places with the desire and intention to make contact, they may well come away with new spirit attachments on board that are simply allowed in through the person’s own desire and intense curiosity to have an encounter they are aware of. Whether they perceive the attachment taking place is beside the point. What they risk is an ongoing and potentially lifelong relationship with a deeply troubled spirit consciousness that could undermine them greatly and alter the trajectory of their life in grievous ways in some cases. This activity is best left to the healers who hold the intention to restore such beings and return them to a spiritual path. That cleans up the environment and saves them from a dark existence and removes them as a hazard to others who do not fully understand such energies and may end up becoming hosts unwittingly.