If anyone has problems uploading images, please let me know and I'll be glad to help. If an image isn't attaching even though it seems to be uploading fine, it's probably an issue with the image, such as being an unsupported image format (although that's rare). I upload images to forums running this software from my phone all the time and haven't had any issues.
For the iPhone there is a setting for the camera, "Formats", with two options, "High Efficiency" and "Most Compatible". Mine is set to "Most Compatible", but not sure if that's the default..
There are three ways to upload images when composing a post. You can click the "Choose files..." link that will prompt you for a file. You can drag and drop images directly into your post. And you can copy/paste images as well (place the text cursor where you want the image to appear, then paste it right into your post).
..Al