Well I wonder why it wasn't before?? Anyway I didn't like (could not do, more like it) the transfer from Mayhem images but this is OK. I want to to describe resizing on Mac is is pretty easy (not so easy as drag and drop but oh well)
I use a free screen capture app called Skitch on my Mac. This is a nice mouse-driven app and allows some drawing markups and will even slide across multiple monitors. I use it all the time (as well ctrl+shift+command+ 4, which puts the clip on the clipboard. Sounds clumsy but works great)
Adding a photo to the post-- View the photo from wherever it is, Open SKITCH, make a selection of the desired photo using the Skitch screen shot tool, then click Export upper left, and then it lets you resize the photo with a slider at the bottom. It is default at 85% (maybe that could be changed, I never tried) but I use the slider set at 40% and then save to a folder called Exported Photos. Then on the post attachment box choose that folder and file and its is pretty easy.
I suppose your instructions were saying pretty much the same thing with a different app, but sorry I didn't get it.
All happy now and made my first Post in STEAM forum with three photos. Yay.
Thank you Martin
cm