Larry - That's a great olive 154. Cleanest one I've seen. I think those are factory clean outs from the mid 1920s. Early body with downward screws on the ends in a late color. I was happy to get the beat up one I have. It also comes with the screws in from the ends.
Here's the two body types:
I shrink the pictures so they are 1200 pixels by 1200 pixels and then drop the quality to lower the number of bytes so it's under the 180KB board requirements. From there, the board will resize the photos so they work well in the slide show and enlarged view.
All the photos I upload are resized so they end up in the same folder using the program I bought to do eBay pictures in 1998. Then when I upload the board or windows10 remembers recently used folders.
When you insert the pictures in the board field, put each image on it's own line with a a blank line between them so they line up vertically.
After a few times it becomes easier.