The third picture in the first post ("a Clueboard Rev 2 that I paid full price for") is 4.616 KB - and that is a lot for a poor connection or a so-called smart phone.
I don't think you can see any difference between the original (huge) PNG and this (compressed to 80%) 347 KB JPG :
[ Invalid Attachment ]
So, less quality and more compression will let you upload all of your pictures into the one and same post ;-)
In my ire, as I had many different versions of those photos, I might have attached the wrong one, as I'd reduced the size on all of them. It just doesn't tell you which or why in those terms. So I was over and over selecting images, resizing them, etc. I have a version sitting there that's 253k. But in my having to delete and add and redo posts, I selected the wrong one apparently- it's not even the literal image I meant to upload. I was getting frustrated by that point.
Which brings me to another issue- the attachment numbers. They have attachment 1, 2, 3, etc beside them. But that doesn't adequately show the number that will be in the attachthumb. And if you're not naming them (as I wasn't in many of them that I uploaded) that can be frustrating and make them non identifiable. In the post, that particular image is labeled attachment 4, i.e. [ Invalid Attachment ].
Looking at the post, attachment 4 is the redscarf. It appears to be something in the way things are renumbered when an attachment is deleted, though it doesn't change the tags in the posts. Maybe. The correct image is there now, and as shown it's 107KB. I was paying attention, but a lot of it was my own frustration at the process coming out, especially with the lack of clarity in the errors.
Interestingly enough, when posting this, I noticed this clearer (if not correct) note following the posting:
Allowed file types: txt, jpg, jpeg, gif, mpg, png, zip, rar, 7z, ahk, fbs, mov, avi, mpg, rm, exe, mid, mp3, wav, grid, opml, tgz, gz, xml, ini, alias, wma, ogg, xz, pdf, apk, wmv, mp4, asf, webp, webm
Restrictions: 50 per post, maximum total size 16000KB, maximum individual size 16000KB
So perhaps if we increase it to that actual amount, or make it agree with the error.