Select the image icon first vs “manage attachments” and see if the pictures will post. You should be able to post multiple images vs one at a time.

You’re welcome

I was having the same issue too and like many unable to post pictures for no apparent reason. I too used the same devices and all of a sudden a month or so ago I wasn’t able to post my pictures. I reached out to Rennlist for support and the only thing they suggested is the format in which any update greater than iOS 11.*.* the default valid extension was no longer jpeg. Apple decided to change the format on the stored pictures with the latest iOS updates. There is a way to change the format for the stored pictures on Apple devices, but for 8s and up only, including the latest iPad.

Moving forward, use the image icon to attach images, and NOT the “Manage Attachments” button. I hope this helps answer your question. For now this appears to be the logical reason why I couldn’t attach pictures following the “Manage Attachments” format.