Culling the Books

I've started trying to sell some of my personal library via Facebook Marketplace. Five titles so far, all being offered for sale under my real name. It's an odd assortment of titles so far.

When I have to move, IF I have somewhere to move TO...it's going to be crazy. I'm going to be crazier.

First-World Problems: Uploading Pix From Phone to Computer

I have been trying to upload this one image file from my phone to my iMac so I can add it to the list I'm trying to sell on Facebook. Haven't really read it in decades, it's a giant coffee-table book about the Vietnam War with lots of images and an "Order of Battle" appendix, and the imagery and troop assignment data were what I thought I wanted it for. I need to be rid of it now.

I don't know why I can't upload the photo file.