For "captioning," I write whatever I want for each pic (sometime a paragraph!).
Then I go up to the paperclip at the top to the right of the fonts. When you click on the paperclip (not the down arrow), it gives you the picture posting dialog box and I upload whatever pics I want.
Then I go back to the paperclip icon. When you click on the down arrow next to the paperclip you will see a list of all the pics you just loaded. When you click on any of them, it will "paste it in" wherever your cursor happens to be.
So I put my cursor under each "blurb" I wrote, then use the paperclip list to paste the appropriate pic there.
Hope this is clear enough.
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10